Mark had
38 the number of marbles that Carl had at first. After Carl gave Mark 30 of his marbles, Mark had
37 the number of marbles that Carl had. How many marbles did Carl have in the end?
| |
Mark |
Carl |
Total |
| Before |
3x10 =
30 u |
8x10 =
80 u |
11x10 =
110 u |
| Change |
+ 3 u |
- 3 u |
|
| After |
3x11 =
33 u |
7x11 =
77 u |
10x11 =
110 u |
The total number of marbles that Mark and Carl had at first and in the end remains unchanged. Make the total number of marbles the same. LCM of 11 and 10 is 110.
Number of marbles that Carl gave Mark
= 33 u - 30 u
= 3 u
3 u = 30
1 u = 30 ÷ 3 = 10
Number of marbles that Carl had in the end
= 77 u
= 77 x 10
= 770
Answer(s): 770
