Ethan and Cole had the same number of cards at first. After Ethan had bought another 33 cards and Cole had lost 7 of his cards, Ethan had thrice as many cards as Cole. How many cards did each of them have at first?
| |
Cole |
Ethan |
| Before |
1 u + 7 |
3 u - 33 |
| Change |
- 7 |
+ 33 |
| After |
1 u |
3 u |
Ethan and Cole had the same number of cards at first.
3 u - 33 = 1 u + 7
3 u - 1 u = 7 + 33
2 u = 40
1 u = 40 ÷ 2 = 20
Number of cards that each of them had at first
= 1 u + 7
= 20 + 7
= 27
Answer(s): 27
