Shiyun and Tina had the same number of mochi balls at first. After Shiyun received another 20 mochi balls and Tina gave away 18 mochi balls, Shiyun had 3 times as many mochi balls as Tina. How many mochi balls did each of them have at first?
| |
Shiyun |
Tina |
| Before |
3 u - 20 |
1 u + 18 |
| Change |
+ 20 |
- 18 |
| After |
3 u |
1 u |
Shiyun and Tina had the same number of mochi balls at first.
3 u - 20 = 1 u + 18
3 u - 1 u = 18 + 20
2 u = 38
1 u = 38 ÷ 2 = 19
Number of mochi balls that each of them at first
= 19 + 18
= 37
Answer(s): 37
