Min and Betty had an equal number of beads at first. Min used
13 of her beads and Betty used
18 of her beads. They used 99 beads altogether. How many beads did Betty have in the end?
|
Min |
Betty |
Before |
3x8 = 24 u |
8x3 = 24 u |
Change |
- 1x8 = - 8 u |
- 1x3 = - 3 u |
After |
2x8 = 16 u |
7x3 = 21 u |
The number of beads that Min and Betty each had at first is the same. Make the number of beads that Min and Betty each had at first the same. LCM of 3 and 8 is 24.
Number of beads that Min and Betty used
= 8 u + 3 u
= 11 u
11 u = 99
1 u = 99 ÷ 11 = 9
Number of beads that Betty had in the end
= 21 u
= 21 x 9
= 189
Answer(s): 189