Math
posted by Beatrice on .
Mrs Allen spends 3/5 of her money at the grocery store. Next she spends 3/5 of her remaining money at the petrol station. She then has $8.00 left.
I know the answer is$50 but i don't know how to explain it!!!

You could start by stating the question. Do you want to know how much money she started with? If so, call that amount X. Then do the algebra.
(2/5)X * (2/5) = (4/25) X = 8
X = 200/4 = 50