Simon had
35 as many stickers as Linda. After Simon bought another 21 stickers, he had 15 less stickers than Linda. How many stickers did Simon have at first?
|
Simon |
Linda |
Before |
3 u |
5 u |
Change |
+ 21 |
|
After |
3 u + 21 |
5 u |
Linda had 15 more stickers than Simon in the end. So, if Simon had another 15 stickers, he would have the same number of stickers as Linda.
5 u = 3 u + 21 + 15
5 u - 3 u = 21 + 15
2 u = 36
1 u = 36 ÷ 2 = 18
Number of stickers that Simon had at first
= 3 u
= 3 x 18
= 54
Answer: 54