How can I use four 7's to equal the number 87? [closed]

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How can I use four 7's to equal the number 87?



Help is greatly appreciated!










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closed as off-topic by quid♦ Sep 9 at 16:08


This question appears to be off-topic. The users who voted to close gave this specific reason:


  • "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – quid
If this question can be reworded to fit the rules in the help center, please edit the question.








  • 4




    What about $77+7+[sqrt 7]$?
    – Mohammad Zuhair Khan
    Sep 8 at 6:27











  • Mohammad Zuhair Khan -- I'm not sure if I can round it, but maybe this is the right answer. Thank you!
    – georgia lucilia
    Sep 8 at 6:37










  • Where did you get this question?
    – Mohammad Zuhair Khan
    Sep 8 at 6:39






  • 4




    if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
    – dezdichado
    Sep 8 at 6:40










  • Mohammad Zuhair Khan -- From a challenge packet.
    – georgia lucilia
    Sep 8 at 6:47














up vote
0
down vote

favorite
3












How can I use four 7's to equal the number 87?



Help is greatly appreciated!










share|cite|improve this question















closed as off-topic by quid♦ Sep 9 at 16:08


This question appears to be off-topic. The users who voted to close gave this specific reason:


  • "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – quid
If this question can be reworded to fit the rules in the help center, please edit the question.








  • 4




    What about $77+7+[sqrt 7]$?
    – Mohammad Zuhair Khan
    Sep 8 at 6:27











  • Mohammad Zuhair Khan -- I'm not sure if I can round it, but maybe this is the right answer. Thank you!
    – georgia lucilia
    Sep 8 at 6:37










  • Where did you get this question?
    – Mohammad Zuhair Khan
    Sep 8 at 6:39






  • 4




    if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
    – dezdichado
    Sep 8 at 6:40










  • Mohammad Zuhair Khan -- From a challenge packet.
    – georgia lucilia
    Sep 8 at 6:47












up vote
0
down vote

favorite
3









up vote
0
down vote

favorite
3






3





How can I use four 7's to equal the number 87?



Help is greatly appreciated!










share|cite|improve this question















How can I use four 7's to equal the number 87?



Help is greatly appreciated!







recreational-mathematics






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edited Sep 8 at 6:31









N. F. Taussig

39.7k93153




39.7k93153










asked Sep 8 at 6:25









georgia lucilia

75




75




closed as off-topic by quid♦ Sep 9 at 16:08


This question appears to be off-topic. The users who voted to close gave this specific reason:


  • "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – quid
If this question can be reworded to fit the rules in the help center, please edit the question.




closed as off-topic by quid♦ Sep 9 at 16:08


This question appears to be off-topic. The users who voted to close gave this specific reason:


  • "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – quid
If this question can be reworded to fit the rules in the help center, please edit the question.







  • 4




    What about $77+7+[sqrt 7]$?
    – Mohammad Zuhair Khan
    Sep 8 at 6:27











  • Mohammad Zuhair Khan -- I'm not sure if I can round it, but maybe this is the right answer. Thank you!
    – georgia lucilia
    Sep 8 at 6:37










  • Where did you get this question?
    – Mohammad Zuhair Khan
    Sep 8 at 6:39






  • 4




    if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
    – dezdichado
    Sep 8 at 6:40










  • Mohammad Zuhair Khan -- From a challenge packet.
    – georgia lucilia
    Sep 8 at 6:47












  • 4




    What about $77+7+[sqrt 7]$?
    – Mohammad Zuhair Khan
    Sep 8 at 6:27











  • Mohammad Zuhair Khan -- I'm not sure if I can round it, but maybe this is the right answer. Thank you!
    – georgia lucilia
    Sep 8 at 6:37










  • Where did you get this question?
    – Mohammad Zuhair Khan
    Sep 8 at 6:39






  • 4




    if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
    – dezdichado
    Sep 8 at 6:40










  • Mohammad Zuhair Khan -- From a challenge packet.
    – georgia lucilia
    Sep 8 at 6:47







4




4




What about $77+7+[sqrt 7]$?
– Mohammad Zuhair Khan
Sep 8 at 6:27





What about $77+7+[sqrt 7]$?
– Mohammad Zuhair Khan
Sep 8 at 6:27













Mohammad Zuhair Khan -- I'm not sure if I can round it, but maybe this is the right answer. Thank you!
– georgia lucilia
Sep 8 at 6:37




Mohammad Zuhair Khan -- I'm not sure if I can round it, but maybe this is the right answer. Thank you!
– georgia lucilia
Sep 8 at 6:37












Where did you get this question?
– Mohammad Zuhair Khan
Sep 8 at 6:39




Where did you get this question?
– Mohammad Zuhair Khan
Sep 8 at 6:39




4




4




if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
– dezdichado
Sep 8 at 6:40




if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
– dezdichado
Sep 8 at 6:40












Mohammad Zuhair Khan -- From a challenge packet.
– georgia lucilia
Sep 8 at 6:47




Mohammad Zuhair Khan -- From a challenge packet.
– georgia lucilia
Sep 8 at 6:47










1 Answer
1






active

oldest

votes

















up vote
4
down vote













In challenges like this it is quite common to allow decimals to omit a leading zero. That is, we can write $.7$ instead of $0.7$, and we have



$77+frac7.7=87.$






share|cite|improve this answer




















  • @georgialucilia Without decimals, we could have $$biglceil77+7+sqrt7bigrceil=87$$ instead, such that $lceilldots rceil$ denotes the ceiling function (with some information on the floor function in the link as well) :D
    – user477343
    Sep 8 at 7:56











  • @georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
    – user477343
    Sep 8 at 8:01







  • 1




    Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
    – Mohammad Zuhair Khan
    Sep 8 at 9:38

















1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
4
down vote













In challenges like this it is quite common to allow decimals to omit a leading zero. That is, we can write $.7$ instead of $0.7$, and we have



$77+frac7.7=87.$






share|cite|improve this answer




















  • @georgialucilia Without decimals, we could have $$biglceil77+7+sqrt7bigrceil=87$$ instead, such that $lceilldots rceil$ denotes the ceiling function (with some information on the floor function in the link as well) :D
    – user477343
    Sep 8 at 7:56











  • @georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
    – user477343
    Sep 8 at 8:01







  • 1




    Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
    – Mohammad Zuhair Khan
    Sep 8 at 9:38














up vote
4
down vote













In challenges like this it is quite common to allow decimals to omit a leading zero. That is, we can write $.7$ instead of $0.7$, and we have



$77+frac7.7=87.$






share|cite|improve this answer




















  • @georgialucilia Without decimals, we could have $$biglceil77+7+sqrt7bigrceil=87$$ instead, such that $lceilldots rceil$ denotes the ceiling function (with some information on the floor function in the link as well) :D
    – user477343
    Sep 8 at 7:56











  • @georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
    – user477343
    Sep 8 at 8:01







  • 1




    Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
    – Mohammad Zuhair Khan
    Sep 8 at 9:38












up vote
4
down vote










up vote
4
down vote









In challenges like this it is quite common to allow decimals to omit a leading zero. That is, we can write $.7$ instead of $0.7$, and we have



$77+frac7.7=87.$






share|cite|improve this answer












In challenges like this it is quite common to allow decimals to omit a leading zero. That is, we can write $.7$ instead of $0.7$, and we have



$77+frac7.7=87.$







share|cite|improve this answer












share|cite|improve this answer



share|cite|improve this answer










answered Sep 8 at 7:52









nickgard

1,6551414




1,6551414











  • @georgialucilia Without decimals, we could have $$biglceil77+7+sqrt7bigrceil=87$$ instead, such that $lceilldots rceil$ denotes the ceiling function (with some information on the floor function in the link as well) :D
    – user477343
    Sep 8 at 7:56











  • @georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
    – user477343
    Sep 8 at 8:01







  • 1




    Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
    – Mohammad Zuhair Khan
    Sep 8 at 9:38
















  • @georgialucilia Without decimals, we could have $$biglceil77+7+sqrt7bigrceil=87$$ instead, such that $lceilldots rceil$ denotes the ceiling function (with some information on the floor function in the link as well) :D
    – user477343
    Sep 8 at 7:56











  • @georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
    – user477343
    Sep 8 at 8:01







  • 1




    Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
    – Mohammad Zuhair Khan
    Sep 8 at 9:38















@georgialucilia Without decimals, we could have $$biglceil77+7+sqrt7bigrceil=87$$ instead, such that $lceilldots rceil$ denotes the ceiling function (with some information on the floor function in the link as well) :D
– user477343
Sep 8 at 7:56





@georgialucilia Without decimals, we could have $$biglceil77+7+sqrt7bigrceil=87$$ instead, such that $lceilldots rceil$ denotes the ceiling function (with some information on the floor function in the link as well) :D
– user477343
Sep 8 at 7:56













@georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
– user477343
Sep 8 at 8:01





@georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
– user477343
Sep 8 at 8:01





1




1




Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
– Mohammad Zuhair Khan
Sep 8 at 9:38




Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
– Mohammad Zuhair Khan
Sep 8 at 9:38


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