Shannon and Eva had an equal number of erasers at first. Shannon used
13 of her erasers and Eva used
16 of her erasers. They used 18 erasers altogether. How many erasers did Eva have in the end?
| |
Shannon |
Eva |
| Before |
3x2 =
6 u |
6x1 =
6 u |
| Change |
- 1x2 =
- 2 u |
- 1x1 =
- 1 u |
| After |
2x2 =
4 u |
5x1 =
5 u |
The number of erasers that Shannon and Eva each had at first is the same. Make the number of erasers that Shannon and Eva each had at first the same. LCM of 3 and 6 is 6.
Number of erasers that Shannon and Eva used
= 2 u + 1 u
= 3 u
3 u = 18
1 u = 18 ÷ 3 = 6
Number of erasers that Eva had in the end
= 5 u
= 5 x 6
= 30
Answer(s): 30
