Seth had
58 as many pens as Gwen. After Seth bought another 17 pens, he had 10 less pens than Gwen. How many pens did Seth have at first?
|
Seth |
Gwen |
Before |
5 u |
8 u |
Change |
+ 17 |
|
After |
5 u + 17 |
8 u |
Gwen had 10 more pens than Seth in the end. So, if Seth had another 10 pens, he would have the same number of pens as Gwen.
8 u = 5 u + 17 + 10
8 u - 5 u = 17 + 10
3 u = 27
1 u = 27 ÷ 3 = 9
Number of pens that Seth had at first
= 5 u
= 5 x 9
= 45
Answer: 45