Problema Solution
Bob used 4/5 of his money to buy books and 15% of the remainder to buy pens. What is the ratio of the amount of money spent on pens to the amount of money spent on books?
Answer provided by our tutors
Total money: x
Money spent on books: 4x/5
Money spent on pens: 0.15*(x - 4x/5)
0.15*(x - 4x/5)) : (4x/5) = (0.15/5): (4/5) = 3 : 80
The ratio is 3 : 80.