Riordan and Elyse had the same number of mochi balls. After Elyse gave away 21 mochi balls and Riordan gave away 42 mochi balls, Elyse had 4 times as many mochi balls as Riordan. How many mochi balls did each of them have at first?
| |
Riordan |
Elyse |
| Before |
1 u + 42 |
4 u + 21 |
| Change |
- 42 |
- 21 |
| After |
1 u |
4 u |
The number of mochi balls that Riordan and Elyse had at first is the same.
4 u + 21 = 1 u + 42
4 u - 1 u = 42 - 21
3 u = 21
1 u = 21 ÷ 3 = 7
Number of mochi balls that each of them had at first
= 1 u + 42
= 7 + 42
= 49
Answer(s): 49
