Cece is 3 years older than Jess. The sum of their ages is 55 years old. How old are Jess and Cece?

Quick translate "x is 12 units from 20" into an equation. what are the values of x being described? if you can answer any of my other questions that'd be great too

Prove that quadrilateral is a rhombus.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16