The ratio of boys to girls in a school is 4:5. How many boys are in the school if there are 720 students.

Answer: 320 boys

Step-by-step explanation: you would first take the total number (720) and divide it by the total number shown in the ratio (5+4=9)

720/9 = 80

You would then take 80 and multiply it by 4 because that is the number representing the boys

80*4 = 320