Question

In class of 49 student number of girls is 2/5 of the boys find the number cof boys In the class

Answer 1

Total number of students = 49

Find the ratio of girls : boys

Ratio of girls : boys = 2/5 : 1

Multiply the ratio by 5:

Ratio of girls : boys = 2 : 5

Define x:

Let x be the constant ratio

Ratio of girls : boys = 2x : 5x

Solve x:

2x + 5x = 49

7x = 49

x = 49 ÷ 7

x = 7

Find the number of boys:

boys = 5x = 5(7) = 35

Answer: There are 35 boys in the class.

Answer 2

Here is your solution

Given:-

Total number of student = 49

Ratio of girl to boy is 2:5

Let x be constant ratio

=>2x+5x=49

=>7x=49

=>x=7

Hence

Number of boys is 5x = 5×7= 35 students

There are 35 boy in class

Hope it helps you