Gabby and Shiyun had the same number of marbles. After Gabby had given away 72 marbles, Shiyun had 3 times as many marbles as Gabby. How many marbles did each of them have at first?
| |
Gabby |
Shiyun |
| Before |
1 u + 72 |
3 u |
| Change |
- 72 |
|
| After |
1 u |
3 u |
Number of marbles that Shiyun had remains unchanged.
Number of marbles that Gabby and Shiyun had at first is equal.
3 u = 1 u + 72
3 u - 1 u = 72
2 u = 72
1 u = 72 ÷ 2= 36
Number of marbles that each of them had at first
= 1 u + 72
= 36 + 72
= 108
Answer(s): 108
