Gwen and Lynn had an equal number of erasers at first. Gwen used
15 of her erasers and Lynn used
17 of her erasers. They used 24 erasers altogether. How many erasers did Lynn have in the end?
| |
Gwen |
Lynn |
| Before |
5x7 =
35 u |
7x5 =
35 u |
| Change |
- 1x7 =
- 7 u |
- 1x5 =
- 5 u |
| After |
4x7 =
28 u |
6x5 =
30 u |
The number of erasers that Gwen and Lynn each had at first is the same. Make the number of erasers that Gwen and Lynn each had at first the same. LCM of 5 and 7 is 35.
Number of erasers that Gwen and Lynn used
= 7 u + 5 u
= 12 u
12 u = 24
1 u = 24 ÷ 12 = 2
Number of erasers that Lynn had in the end
= 30 u
= 30 x 2
= 60
Answer(s): 60
