Min had the same number of yellow, grey and silver cards at first. After giving some yellow and grey cards and 64 silver cards away, Min had 212 cards left. There were 3 times as many yellow cards as grey cards left. The number of silver cards left was 47 fewer than the number of yellow cards left. How many silver cards did she have at first?
| |
Grey |
Yellow |
Silver |
Total |
| Before |
3 u + 17 |
3 u + 17 |
3 u + 17 |
|
| Change |
- 2 u - 17 |
- 17 |
- 64 |
|
| After |
1 u |
3 u |
3 u - 47 |
212 |
Min had the same number of yellow, grey and silver cards at first.
Total number of cards in the end
= 1 u + 3 u + 3 u - 47
= 7 u - 47
7 u - 47 = 212
7 u = 212 + 47
7 u = 259
1 u = 259 ÷ 7 = 37
Number of silver cards that Min had at first
= 3 u - 47 + 64
= 3 u + 17
= 3 x 37 + 17
= 128
Answer(s): 128
