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