Help needed for this question.

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?

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

Pls never taught i’m really confused and i rlly need