The difference of a number and 12 is 4

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?