The mean of four numbers is $12$. When the greatest number is removed, the mean becomes $9$. What number was...












-1














I'm Akash, a nine-year-old fourth-grader living in San Angelo, Texas. Here's a question that I couldn't solve, apparently:




The mean of four numbers is $12$. When the greatest number is removed, the mean of the remaining three numbers is $9$. What number was removed?




Thanks so much if you can solve it! PS: You probably can. LOL :)






means







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closed as off-topic by Shailesh, Lord Shark the Unknown, max_zorn, Chinnapparaj R, Brahadeesh Nov 29 '18 at 7:50


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." – Shailesh, Lord Shark the Unknown, max_zorn, Chinnapparaj R, Brahadeesh

If this question can be reworded to fit the rules in the help center, please edit the question.













  • Aakash, you must show your efforts and where you are stuck.
    – Shailesh
    Nov 29 '18 at 3:32
















-1














I'm Akash, a nine-year-old fourth-grader living in San Angelo, Texas. Here's a question that I couldn't solve, apparently:




The mean of four numbers is $12$. When the greatest number is removed, the mean of the remaining three numbers is $9$. What number was removed?




Thanks so much if you can solve it! PS: You probably can. LOL :)






means







share|cite|improve this question















closed as off-topic by Shailesh, Lord Shark the Unknown, max_zorn, Chinnapparaj R, Brahadeesh Nov 29 '18 at 7:50


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." – Shailesh, Lord Shark the Unknown, max_zorn, Chinnapparaj R, Brahadeesh

If this question can be reworded to fit the rules in the help center, please edit the question.













  • Aakash, you must show your efforts and where you are stuck.
    – Shailesh
    Nov 29 '18 at 3:32














-1












-1








-1







I'm Akash, a nine-year-old fourth-grader living in San Angelo, Texas. Here's a question that I couldn't solve, apparently:




The mean of four numbers is $12$. When the greatest number is removed, the mean of the remaining three numbers is $9$. What number was removed?




Thanks so much if you can solve it! PS: You probably can. LOL :)






means







share|cite|improve this question















I'm Akash, a nine-year-old fourth-grader living in San Angelo, Texas. Here's a question that I couldn't solve, apparently:




The mean of four numbers is $12$. When the greatest number is removed, the mean of the remaining three numbers is $9$. What number was removed?




Thanks so much if you can solve it! PS: You probably can. LOL :)






means




means






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Nov 29 '18 at 3:52









Andrei

11.5k21026




11.5k21026










asked Nov 29 '18 at 3:28









TECHronTECHron

11




11




closed as off-topic by Shailesh, Lord Shark the Unknown, max_zorn, Chinnapparaj R, Brahadeesh Nov 29 '18 at 7:50


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." – Shailesh, Lord Shark the Unknown, max_zorn, Chinnapparaj R, Brahadeesh

If this question can be reworded to fit the rules in the help center, please edit the question.




closed as off-topic by Shailesh, Lord Shark the Unknown, max_zorn, Chinnapparaj R, Brahadeesh Nov 29 '18 at 7:50


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." – Shailesh, Lord Shark the Unknown, max_zorn, Chinnapparaj R, Brahadeesh

If this question can be reworded to fit the rules in the help center, please edit the question.












  • Aakash, you must show your efforts and where you are stuck.
    – Shailesh
    Nov 29 '18 at 3:32


















  • Aakash, you must show your efforts and where you are stuck.
    – Shailesh
    Nov 29 '18 at 3:32
















Aakash, you must show your efforts and where you are stuck.
– Shailesh
Nov 29 '18 at 3:32




Aakash, you must show your efforts and where you are stuck.
– Shailesh
Nov 29 '18 at 3:32










1 Answer
1






active

oldest

votes


















2














If you know the mean and the number of terms, you know the sum (mean=sum/# of terms). From the first sentence, you find the sum of four numbers. In the second sentence you get the sum of the remaining three. Can you take it from here?






share|cite|improve this answer





















  • Yeah, I'm pretty sure I can. Thanks a lot, Andrei (if that's your username)!
    – TECHron
    Nov 29 '18 at 3:50


















1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2














If you know the mean and the number of terms, you know the sum (mean=sum/# of terms). From the first sentence, you find the sum of four numbers. In the second sentence you get the sum of the remaining three. Can you take it from here?






share|cite|improve this answer





















  • Yeah, I'm pretty sure I can. Thanks a lot, Andrei (if that's your username)!
    – TECHron
    Nov 29 '18 at 3:50
















2














If you know the mean and the number of terms, you know the sum (mean=sum/# of terms). From the first sentence, you find the sum of four numbers. In the second sentence you get the sum of the remaining three. Can you take it from here?






share|cite|improve this answer





















  • Yeah, I'm pretty sure I can. Thanks a lot, Andrei (if that's your username)!
    – TECHron
    Nov 29 '18 at 3:50














2












2








2






If you know the mean and the number of terms, you know the sum (mean=sum/# of terms). From the first sentence, you find the sum of four numbers. In the second sentence you get the sum of the remaining three. Can you take it from here?






share|cite|improve this answer












If you know the mean and the number of terms, you know the sum (mean=sum/# of terms). From the first sentence, you find the sum of four numbers. In the second sentence you get the sum of the remaining three. Can you take it from here?







share|cite|improve this answer












share|cite|improve this answer



share|cite|improve this answer










answered Nov 29 '18 at 3:34









AndreiAndrei

11.5k21026




11.5k21026












  • Yeah, I'm pretty sure I can. Thanks a lot, Andrei (if that's your username)!
    – TECHron
    Nov 29 '18 at 3:50


















  • Yeah, I'm pretty sure I can. Thanks a lot, Andrei (if that's your username)!
    – TECHron
    Nov 29 '18 at 3:50
















Yeah, I'm pretty sure I can. Thanks a lot, Andrei (if that's your username)!
– TECHron
Nov 29 '18 at 3:50




Yeah, I'm pretty sure I can. Thanks a lot, Andrei (if that's your username)!
– TECHron
Nov 29 '18 at 3:50



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