Fanny and Xylia had an equal number of erasers at first. Fanny used
15 of her erasers and Xylia used
110 of her erasers. They used 15 erasers altogether. How many erasers did Xylia have in the end?
| |
Fanny |
Xylia |
| 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 Fanny and Xylia each had at first is the same. Make the number of erasers that Fanny and Xylia each had at first the same. LCM of 5 and 10 is 10.
Number of erasers that Fanny and Xylia used
= 2 u + 1 u
= 3 u
3 u = 15
1 u = 15 ÷ 3 = 5
Number of erasers that Xylia had in the end
= 9 u
= 9 x 5
= 45
Answer(s): 45
