Question

The ratio of the number of boys to the number of girls in a class is 12:13 What percentage of the class are boys?

Answer 1

48%

Explanation:

b/g=12/13

so b/12=g/13=k

b=12k

g=13k

so b+g=25k so k=b+g/25

b=12*(b+g)/25=12*4*(b+g)/25*4=48(b+g)/100

so 48% are boys

Answer 2

48%

Explanation:

add the ratio together which is 25

pick the ratio of boy

divide 12 by 25 and multiply 100

12/25×100= 48%