the ratio of boys to girls in a class is 8:17 . how many boys are there if total students are 375
There are b boys an g girls in the class
b / g = 8 / 17
Multiply both sides by g
b = 8 g / 17
b + g = 375
8 g / 17 + g = 375
8 g / 17 + 17 g / 17 = 375
25 g / 17 = 375 Multiply both sides by 17
25 g = 375 * 17
25 g = 6375 Divide both sides by 25
g = 6375 / 25
g = 255
b = 375 - 255
b = 120