Tommy had
710 as many buttons as Linda. After Tommy gave away 47 buttons, he had 89 less buttons than Linda. How many buttons did Linda have?
| |
Tommy |
Linda |
| Before |
7 u |
10 u |
| Change |
- 47 |
|
| After |
7 u - 47 |
10 u |
Linda had 89 more buttons than Tommy in the end. So, if Tommy had another 89 buttons, he would have the same number of buttons as Linda.
10 u = 7 u - 47 + 89
10 u - 7 u = 89 - 47
3 u = 42
1 u = 42 ÷ 3 = 14
Number of buttons that Linda had at first
= 10 u
= 10 x 14
= 140
Answer: 140
