Question

Mary spent 2/5 of her money on a clculator and 4/7 of the remainder on a book. what fraction of her money did she spend on the book?

Answer 1

let her total money be x
money left after buying calc=x-2/5x=3x/5
money spent on book = 4/7*3x/5 = 12x/35
so se spent 12/35 on her book