Billy had
25 as many erasers as Marion. After Billy gave away 10 erasers, he had 52 less erasers than Marion. How many erasers did Marion have?
| |
Billy |
Marion |
| Before |
2 u |
5 u |
| Change |
- 10 |
|
| After |
2 u - 10 |
5 u |
Marion had 52 more erasers than Billy in the end. So, if Billy had another 52 erasers, he would have the same number of erasers as Marion.
5 u = 2 u - 10 + 52
5 u - 2 u = 52 - 10
3 u = 42
1 u = 42 ÷ 3 = 14
Number of erasers that Marion had at first
= 5 u
= 5 x 14
= 70
Answer: 70
