Jack and Zane had the same number of cards at first. After Jack had bought another 36 cards and Zane had lost 9 of his cards, Jack had four times as many cards as Zane. How many cards did each of them have at first?
| |
Zane |
Jack |
| Before |
1 u + 9 |
4 u - 36 |
| Change |
- 9 |
+ 36 |
| After |
1 u |
4 u |
Jack and Zane had the same number of cards at first.
4 u - 36 = 1 u + 9
4 u - 1 u = 9 + 36
3 u = 45
1 u = 45 ÷ 3 = 15
Number of cards that each of them had at first
= 1 u + 9
= 15 + 9
= 24
Answer(s): 24
