Question

The ratio of boys to girls in a class is 5:7. There are 36 students in the class. How many students are boys?

Answer 1

Boys : Girls : Total    
  5     :  7      : 5 + 7 
  5 .   ;  7 .    : 12

-------------------------------------
Find 1 part :
-------------------------------------
12 parts = 36 
1 part = 36 ÷ 12
1 part = 3

-------------------------------------
Find number of boys (5 parts)
-------------------------------------
1 part = 3
5 parts = 3 x 5 
5 parts = 15


-------------------------------------
Answer: There are 15 boys.
-------------------------------------

Answer 2

Answer:

number of boys = 15

Step-by-step explanation:

The ratio of boys to girls is 5 : 7

Sum of the ratio is 12

The total students in the class is 36 students which include girls and boys.

since the ratio of boys to girls is known the number of boys and the number of girls can be computed.

Total student = 36

number of boys = 5/12 × 36

number of boys = 5 × 3

number of boys = 15

The number of girls = 36 - 15 = 21