. Air is pumped to fill a spherical balloon. Each time air is pumped, 300cm3 of air enters the balloon. How many times would someone need to pump the balloon to get it to fill to a radius of 10cm?

Answer 1

First find the volume of the balloon: 4/3 PI * R^3 = 4/3 * 3.14 * 1000 = 4186.7 cm^3

Divide volume by 300 cm^2 to find number of times need to pump balloon = 4186.7 / 300 = 13.96 ~ 14 times