Daniel and Mark had the same number of cards at first. After Daniel had bought another 27 cards and Mark had lost 7 of his cards, Daniel had thrice as many cards as Mark. How many cards did each of them have at first?
| |
Mark |
Daniel |
| Before |
1 u + 7 |
3 u - 27 |
| Change |
- 7 |
+ 27 |
| After |
1 u |
3 u |
Daniel and Mark had the same number of cards at first.
3 u - 27 = 1 u + 7
3 u - 1 u = 7 + 27
2 u = 34
1 u = 34 ÷ 2 = 17
Number of cards that each of them had at first
= 1 u + 7
= 17 + 7
= 24
Answer(s): 24
