Sean had
25 as many stickers as Tina. After Sean bought another 20 stickers, he had 13 less stickers than Tina. How many stickers did Sean have at first?
|
Sean |
Tina |
Before |
2 u |
5 u |
Change |
+ 20 |
|
After |
2 u + 20 |
5 u |
Tina had 13 more stickers than Sean in the end. So, if Sean had another 13 stickers, he would have the same number of stickers as Tina.
5 u = 2 u + 20 + 13
5 u - 2 u = 20 + 13
3 u = 33
1 u = 33 ÷ 3 = 11
Number of stickers that Sean had at first
= 2 u
= 2 x 11
= 22
Answer: 22