Harry had
310 as many erasers as Erika. After Harry gave away 34 erasers, he had 55 less erasers than Erika. How many erasers did Erika have?
| |
Harry |
Erika |
| Before |
3 u |
10 u |
| Change |
- 34 |
|
| After |
3 u - 34 |
10 u |
Erika had 55 more erasers than Harry in the end. So, if Harry had another 55 erasers, he would have the same number of erasers as Erika.
10 u = 3 u - 34 + 55
10 u - 3 u = 55 - 34
7 u = 21
1 u = 21 ÷ 7 = 3
Number of erasers that Erika had at first
= 10 u
= 10 x 3
= 30
Answer: 30
