Mary and Kimberly had an equal number of mochi balls. After Mary bought another 25 mochi balls and Kimberly bought another 5 mochi balls, Mary had thrice as many mochi balls as Kimberly. Find the number of mochi balls that each of them had at first.
| |
Mary |
Kimberly |
| Before |
3 u - 25 |
1 u - 5 |
| Change |
+ 25 |
+ 5 |
| After |
3 u |
1 u |
The number of mochi balls that Mary and Kimberly had at first is the same.
3 u - 25 = 1 u - 5
3 u - 1 u = 25 - 5
2 u = 20
1 u = 20 ÷ 2 = 10
Number of mochi balls that each had at first
= 10 - 5
= 5
Answer(s): 5
