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!
recreational-mathematics
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." â quid
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How can I use four 7's to equal the number 87?
Help is greatly appreciated!
recreational-mathematics
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." â quid
4
What about $77+7+[sqrt 7]$?
â 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!
â georgia lucilia
Sep 8 at 6:37
Where did you get this question?
â Mohammad Zuhair Khan
Sep 8 at 6:39
4
if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
â dezdichado
Sep 8 at 6:40
Mohammad Zuhair Khan -- From a challenge packet.
â georgia lucilia
Sep 8 at 6:47
 |Â
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How can I use four 7's to equal the number 87?
Help is greatly appreciated!
recreational-mathematics
How can I use four 7's to equal the number 87?
Help is greatly appreciated!
recreational-mathematics
recreational-mathematics
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." â quid
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." â quid
4
What about $77+7+[sqrt 7]$?
â 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!
â georgia lucilia
Sep 8 at 6:37
Where did you get this question?
â Mohammad Zuhair Khan
Sep 8 at 6:39
4
if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
â dezdichado
Sep 8 at 6:40
Mohammad Zuhair Khan -- From a challenge packet.
â georgia lucilia
Sep 8 at 6:47
 |Â
show 9 more comments
4
What about $77+7+[sqrt 7]$?
â 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!
â georgia lucilia
Sep 8 at 6:37
Where did you get this question?
â Mohammad Zuhair Khan
Sep 8 at 6:39
4
if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
â dezdichado
Sep 8 at 6:40
Mohammad Zuhair Khan -- From a challenge packet.
â georgia lucilia
Sep 8 at 6:47
4
4
What about $77+7+[sqrt 7]$?
â Mohammad Zuhair Khan
Sep 8 at 6:27
What about $77+7+[sqrt 7]$?
â 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!
â 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!
â georgia lucilia
Sep 8 at 6:37
Where did you get this question?
â Mohammad Zuhair Khan
Sep 8 at 6:39
Where did you get this question?
â Mohammad Zuhair Khan
Sep 8 at 6:39
4
4
if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
â dezdichado
Sep 8 at 6:40
if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
â dezdichado
Sep 8 at 6:40
Mohammad Zuhair Khan -- From a challenge packet.
â georgia lucilia
Sep 8 at 6:47
Mohammad Zuhair Khan -- From a challenge packet.
â georgia lucilia
Sep 8 at 6:47
 |Â
show 9 more comments
1 Answer
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4
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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
$77+frac7.7=87.$
@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
â user477343
Sep 8 at 7:56
@georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
â user477343
Sep 8 at 8:01
1
Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
â Mohammad Zuhair Khan
Sep 8 at 9:38
add a comment |Â
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
$77+frac7.7=87.$
@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
â user477343
Sep 8 at 7:56
@georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
â user477343
Sep 8 at 8:01
1
Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
â Mohammad Zuhair Khan
Sep 8 at 9:38
add a comment |Â
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
$77+frac7.7=87.$
@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
â user477343
Sep 8 at 7:56
@georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
â user477343
Sep 8 at 8:01
1
Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
â Mohammad Zuhair Khan
Sep 8 at 9:38
add a comment |Â
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
$77+frac7.7=87.$
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
$77+frac7.7=87.$
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
â user477343
Sep 8 at 7:56
@georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
â user477343
Sep 8 at 8:01
1
Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
â Mohammad Zuhair Khan
Sep 8 at 9:38
add a comment |Â
@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
â user477343
Sep 8 at 7:56
@georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
â user477343
Sep 8 at 8:01
1
Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
â 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
â 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
â user477343
Sep 8 at 7:56
@georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
â user477343
Sep 8 at 8:01
@georgialucilia if you want to see many many solutions, perhaps, ask this on the Puzzling Stack Exchange :)
â user477343
Sep 8 at 8:01
1
1
Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
â Mohammad Zuhair Khan
Sep 8 at 9:38
Finally a solution excluding $lfloor rfloor$ and $lceil rceil$ functions. Well done!
â Mohammad Zuhair Khan
Sep 8 at 9:38
add a comment |Â
4
What about $77+7+[sqrt 7]$?
â 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!
â georgia lucilia
Sep 8 at 6:37
Where did you get this question?
â Mohammad Zuhair Khan
Sep 8 at 6:39
4
if you are allowed to concatenate, then $(7+7:7)7$ gives $87.$
â dezdichado
Sep 8 at 6:40
Mohammad Zuhair Khan -- From a challenge packet.
â georgia lucilia
Sep 8 at 6:47