Question

Peter spent 20% of his money on an ebook

he spent 3/5 of the remainder on a phone cover.
He had $40 left. How much money did he have initially?

Answer 1

3/5 equals 0.6, or 60%, 60% + 20% is 80%, so this means 20% is $40. So 40 * 5 is 200. He had $200 originally.