Billy had 5 times as many books as Simon. After Billy and Simon donated 101 books and 5 books away respectively, they were left with an equal number of books. How many books did Billy have at first?
| |
Billy |
Simon |
| Before |
5 u |
1 u |
| Change |
- 101 |
- 5 |
| After |
5 u - 101 |
1 u - 5 |
Billy and Simon had the same number of books left.
5 u - 101 = 1 u - 5
5 u - 1 u = 101 - 5
4 u = 96
1 u = 96 ÷ 4 = 24
Number of books that Billy had at first
= 5 u
= 5 x 24
= 120
Answer(s): 120
