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?

48%

Step-by-step 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

14

step-by-step explanation:

14 x 3 = 42