Kimberly and Zoe had an equal number of buttons at first. Kimberly used
13 of her buttons and Zoe used
18 of her buttons. They used 110 buttons altogether. How many buttons did Zoe have in the end?
|
Kimberly |
Zoe |
Before |
3x8 = 24 u |
8x3 = 24 u |
Change |
- 1x8 = - 8 u |
- 1x3 = - 3 u |
After |
2x8 = 16 u |
7x3 = 21 u |
The number of buttons that Kimberly and Zoe each had at first is the same. Make the number of buttons that Kimberly and Zoe each had at first the same. LCM of 3 and 8 is 24.
Number of buttons that Kimberly and Zoe used
= 8 u + 3 u
= 11 u
11 u = 110
1 u = 110 ÷ 11 = 10
Number of buttons that Zoe had in the end
= 21 u
= 21 x 10
= 210
Answer(s): 210