Mark had
58 the number of marbles that Warren had at first. After Warren gave Mark 35 of his marbles, Mark had
45 the number of marbles that Warren had. How many marbles did Mark have at first?
|
Mark |
Warren |
Total |
Before |
5x9 = 45 u |
8x9 = 72 u |
13x9 = 117 u |
Change |
+ 7 u |
- 7 u |
|
After |
4x13 = 52 u |
5x13 = 65 u |
9x13 = 117 u |
The total number of marbles that Mark and Warren had at first and in the end remains unchanged. Make the total number of marbles the same. LCM of 13 and 9 is 117.
Number of marbles that Warren gave Mark
= 52 u - 45 u
= 7 u
7 u = 35
1 u = 35 ÷ 7 = 5
Number of marbles that Mark had at first
= 45 u
= 45 x 5
= 225
Answer(s): 225