Mark had
38 the number of cards that Seth had at first. After Seth gave Mark 120 of his cards, Mark had
34 the number of cards that Seth had. How many cards did Seth have in the end?
|
Mark |
Seth |
Total |
Before |
3x7 = 21 u |
8x7 = 56 u |
11x7 = 77 u |
Change |
+ 12 u |
- 12 u |
|
After |
3x11 = 33 u |
4x11 = 44 u |
7x11 = 77 u |
The total number of cards that Mark and Seth had at first and in the end remains unchanged. Make the total number of cards the same. LCM of 11 and 7 is 77.
Number of cards that Seth gave Mark
= 33 u - 21 u
= 12 u
12 u = 120
1 u = 120 ÷ 12 = 10
Number of cards that Seth had in the end
= 44 u
= 44 x 10
= 440
Answer(s): 440