What plus what equals 98

Agrocery store has 12 lb of trail mix that is 10% banana chips. the store's manager would like to add banana chips to bring the new mix up to 25% banana chips. write and solve a system of equations to find out how many pounds of banana chips manager needs to add.

What is the solution to the inequality

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?