Warren had
710 as many pens as Fiona. After Warren bought another 17 pens, he had 10 less pens than Fiona. How many pens did Warren have at first?
|
Warren |
Fiona |
Before |
7 u |
10 u |
Change |
+ 17 |
|
After |
7 u + 17 |
10 u |
Fiona had 10 more pens than Warren in the end. So, if Warren had another 10 pens, he would have the same number of pens as Fiona.
10 u = 7 u + 17 + 10
10 u - 7 u = 17 + 10
3 u = 27
1 u = 27 ÷ 3 = 9
Number of pens that Warren had at first
= 7 u
= 7 x 9
= 63
Answer: 63