Xavier had
25 as many pens as Erika. After Xavier gave away 36 pens, he had 72 less pens than Erika. How many pens did Erika have?
| |
Xavier |
Erika |
| Before |
2 u |
5 u |
| Change |
- 36 |
|
| After |
2 u - 36 |
5 u |
Erika had 72 more pens than Xavier in the end. So, if Xavier had another 72 pens, he would have the same number of pens as Erika.
5 u = 2 u - 36 + 72
5 u - 2 u = 72 - 36
3 u = 36
1 u = 36 ÷ 3 = 12
Number of pens that Erika had at first
= 5 u
= 5 x 12
= 60
Answer: 60
