Andy had
310 as many pens as Xylia. After Andy bought another 88 pens, he had 17 less pens than Xylia. How many pens did Andy have at first?
| |
Andy |
Xylia |
| Before |
3 u |
10 u |
| Change |
+ 88 |
|
| After |
3 u + 88 |
10 u |
Xylia had 17 more pens than Andy in the end. So, if Andy had another 17 pens, he would have the same number of pens as Xylia.
10 u = 3 u + 88 + 17
10 u - 3 u = 88 + 17
7 u = 105
1 u = 105 ÷ 7 = 15
Number of pens that Andy had at first
= 3 u
= 3 x 15
= 45
Answer: 45
