Mark had
49 as many stickers as Xuan. After Mark bought another 72 stickers, he had 13 less stickers than Xuan. How many stickers did Mark have at first?
| |
Mark |
Xuan |
| Before |
4 u |
9 u |
| Change |
+ 72 |
|
| After |
4 u + 72 |
9 u |
Xuan had 13 more stickers than Mark in the end. So, if Mark had another 13 stickers, he would have the same number of stickers as Xuan.
9 u = 4 u + 72 + 13
9 u - 4 u = 72 + 13
5 u = 85
1 u = 85 ÷ 5 = 17
Number of stickers that Mark had at first
= 4 u
= 4 x 17
= 68
Answer: 68
