Question

Three people divide up a large pizza. If the first person gets half and the second person gets half as much as the first person , how much is left for the third person?

Answer 1

So, if the first person takes half of the pizza, half of the pizza is left.
If the second person takes half of the amount the first person took, that would be a quarter of the pizza left. 

TL;DR - There is 1/4 of the pizza left