Andy had
79 as many stickers as Gillian. After Andy bought another 15 stickers, he had 15 less stickers than Gillian. How many stickers did Andy have at first?
|
Andy |
Gillian |
Before |
7 u |
9 u |
Change |
+ 15 |
|
After |
7 u + 15 |
9 u |
Gillian had 15 more stickers than Andy in the end. So, if Andy had another 15 stickers, he would have the same number of stickers as Gillian.
9 u = 7 u + 15 + 15
9 u - 7 u = 15 + 15
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Andy had at first
= 7 u
= 7 x 15
= 105
Answer: 105