Jaslyn and Winnie had an equal number of erasers at first. Jaslyn used
13 of her erasers and Winnie used
110 of her erasers. They used 91 erasers altogether. How many erasers did Winnie have in the end?
| |
Jaslyn |
Winnie |
| Before |
3x10 =
30 u |
10x3 =
30 u |
| Change |
- 1x10 =
- 10 u |
- 1x3 =
- 3 u |
| After |
2x10 =
20 u |
9x3 =
27 u |
The number of erasers that Jaslyn and Winnie each had at first is the same. Make the number of erasers that Jaslyn and Winnie each had at first the same. LCM of 3 and 10 is 30.
Number of erasers that Jaslyn and Winnie used
= 10 u + 3 u
= 13 u
13 u = 91
1 u = 91 ÷ 13 = 7
Number of erasers that Winnie had in the end
= 27 u
= 27 x 7
= 189
Answer(s): 189
