Igot the last 3 problems correct and then my mind went blank

daniel is 4 times as old as jessica and is also 15 years older than jessica.

how old is jessica?

Apyramid fits exactly inside a cube. the cube and the pyramid share the same square base, and they are both exactly the same height. the volume of the cube is 66 cubic inches. what is the volume of the pyramid? explain your answer. answer asap