Oliver had
58 as many pens as Irene. After Oliver bought another 38 pens, he had 13 less pens than Irene. How many pens did Oliver have at first?
| |
Oliver |
Irene |
| Before |
5 u |
8 u |
| Change |
+ 38 |
|
| After |
5 u + 38 |
8 u |
Irene had 13 more pens than Oliver in the end. So, if Oliver had another 13 pens, he would have the same number of pens as Irene.
8 u = 5 u + 38 + 13
8 u - 5 u = 38 + 13
3 u = 51
1 u = 51 ÷ 3 = 17
Number of pens that Oliver had at first
= 5 u
= 5 x 17
= 85
Answer: 85
