How can i use models to find part of a number?

Diana is painting statues she has 7/8 of a liter of paint each statue requires 1/20 of a liter of paint how many statues can she paint?

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

An alternative to car buying is to make monthly payments for a period of time, and then return the vehicle to the dealer, or purchase it. this is called