Approximately how many times as great is the volume of a grapefruit with a diameter 16 cm as the volume of a lime with a diameter 8 cm.

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

How do i do this activity, is appreciated

Don't know how to find x given these segment lengths