Min and Joelle had an equal number of erasers at first. Min used
12 of her erasers and Joelle used
19 of her erasers. They used 22 erasers altogether. How many erasers did Joelle have in the end?
| |
Min |
Joelle |
| Before |
2x9 =
18 u |
9x2 =
18 u |
| Change |
- 1x9 =
- 9 u |
- 1x2 =
- 2 u |
| After |
1x9 =
9 u |
8x2 =
16 u |
The number of erasers that Min and Joelle each had at first is the same. Make the number of erasers that Min and Joelle each had at first the same. LCM of 2 and 9 is 18.
Number of erasers that Min and Joelle used
= 9 u + 2 u
= 11 u
11 u = 22
1 u = 22 ÷ 11 = 2
Number of erasers that Joelle had in the end
= 16 u
= 16 x 2
= 32
Answer(s): 32
