Question

laura spent 20 percent of her money on a dress. she spent 2/5 of the remainder on a book. she had $72 left. how much money did she have at first?

Answer 1

after dress she has 4/5 of her money left

after book would have left (3/5)(4/5) or 12/25 of her money left

so (12/25)x = 72
x = 150

I will leave it up to your to check my answer