Betty and Gillian had an equal number of erasers at first. Betty used
15 of her erasers and Gillian used
16 of her erasers. They used 44 erasers altogether. How many erasers did Gillian have in the end?
|
Betty |
Gillian |
Before |
5x6 = 30 u |
6x5 = 30 u |
Change |
- 1x6 = - 6 u |
- 1x5 = - 5 u |
After |
4x6 = 24 u |
5x5 = 25 u |
The number of erasers that Betty and Gillian each had at first is the same. Make the number of erasers that Betty and Gillian each had at first the same. LCM of 5 and 6 is 30.
Number of erasers that Betty and Gillian used
= 6 u + 5 u
= 11 u
11 u = 44
1 u = 44 ÷ 11 = 4
Number of erasers that Gillian had in the end
= 25 u
= 25 x 4
= 100
Answer(s): 100