Question

The ratio of boys to girls in a class is 3:5. There are 40 students in the class. How many students are boys?

Answer 1

Answer: 15 boys

Explanation:

3 + 5 = 8

3/8*40 = 15

5/8*40=25

15:25

There are 15 boys.

Answer 2

There are 15 boys.

Explanation:

b = Boys

g = Girls

Set an Equation

b/g = 3/5

b + g = 40

Put 40 in for g

b/40 - b = 5b

Simplify

3 (40 - b) = 5b

Simplify

120 - 3b = 5b

Simplify

8b = 120

Simplify

4b = 60

Simplify

b = 15