Peter and Oliver shared some erasers. Peter took
511 of the erasers. After Peter lost 12 erasers, Oliver had thrice as many erasers as Peter. How many erasers did Oliver have in the end?
|
Peter |
Oliver |
Before |
5 u |
6 u |
Change |
- 12 |
|
After |
1x2 = 2 u |
3x2 = 6 u |
The number of erasers that Oliver had remains the same. Make the number of erasers that Oliver had the same. LCM of 6 and 3 is 6.
Number of erasers that Peter lost
= 5 u - 2 u
= 3 u
3 u = 12
1 u = 12 ÷ 3 = 4
Number of erasers that Oliver had in the end
= 6 u
= 6 x 4
= 24
Answer(s): 24