SOLUTION: There are 15 girls in the fifth-grade chorus. If 5/6 of the members are girls, how many members are boys?

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Question 1092567: There are 15 girls in the fifth-grade chorus. If 5/6 of the members are girls, how many members are boys?
Answer by ikleyn(52842) About Me  (Show Source):
You can put this solution on YOUR website!
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If  5%2F6  of the value is 15,  then 1%2F6 of the value is  1%2F5 of 15, i.e. 3.

 
If  1%2F6  of the value is  3,  then the value itself is  6 times  3, i.e. 18.


Thus the fifth-grade chorus consists of  18 students,  and  18-15 = 3 of them are boys.


It is a good exercise in mental calculations.