What is the quantity that is proportional to 90/2

What is the unit rate of, 75% high fiber chimp food to 25% high protein chimp food.

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches. approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *

Given abc find the values of x and y. in your final answer, include all of your calculations.