Julie and Rachel had an equal number of marbles at first. Julie used
13 of her marbles and Rachel used
18 of her marbles. They used 110 marbles altogether. How many marbles did Rachel have in the end?
|
Julie |
Rachel |
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 Julie and Rachel each had at first is the same. Make the number of marbles that Julie and Rachel each had at first the same. LCM of 3 and 8 is 24.
Number of marbles that Julie and Rachel used
= 8 u + 3 u
= 11 u
11 u = 110
1 u = 110 ÷ 11 = 10
Number of marbles that Rachel had in the end
= 21 u
= 21 x 10
= 210
Answer(s): 210