Shiyun had 13 more mochi balls than Albert at first. After Albert had eaten 20 of his mochi balls, Shiyun had 4 times as many mochi balls as Albert. How many mochi balls did Shiyun and Albert have in total at first?
| |
Shiyun |
Albert |
Total |
| Before |
1 u + 20 + 13 |
1 u + 20 |
5 u + 20 |
| Change |
|
- 20 |
|
| After |
4 u |
1 u |
|
The number of mochi balls that Shiyun had at first remains unchanged.
4 u = 1 u + 20 + 13
4 u - 1 u = 33
3 u = 33
1 u = 33 ÷ 3 = 11
Number of mochi balls that they had at first
= 5 u + 20
= 5 x 11 + 20
= 55 + 20
= 75
Answer(s): 75
