Zoe and Vanessa had an equal number of erasers at first. Zoe used
15 of her erasers and Vanessa used
110 of her erasers. They used 24 erasers altogether. How many erasers did Vanessa have in the end?
| |
Zoe |
Vanessa |
| Before |
5x2 =
10 u |
10x1 =
10 u |
| Change |
- 1x2 =
- 2 u |
- 1x1 =
- 1 u |
| After |
4x2 =
8 u |
9x1 =
9 u |
The number of erasers that Zoe and Vanessa each had at first is the same. Make the number of erasers that Zoe and Vanessa each had at first the same. LCM of 5 and 10 is 10.
Number of erasers that Zoe and Vanessa used
= 2 u + 1 u
= 3 u
3 u = 24
1 u = 24 ÷ 3 = 8
Number of erasers that Vanessa had in the end
= 9 u
= 9 x 8
= 72
Answer(s): 72
