Vincent had
25 the number of cards that Cody had at first. After Cody gave Vincent 70 of his cards, Vincent had
45 the number of cards that Cody had. How many cards did Vincent have at first?
|
Vincent |
Cody |
Total |
Before |
2x9 = 18 u |
5x9 = 45 u |
7x9 = 63 u |
Change |
+ 10 u |
- 10 u |
|
After |
4x7 = 28 u |
5x7 = 35 u |
9x7 = 63 u |
The total number of cards that Vincent and Cody had at first and in the end remains unchanged. Make the total number of cards the same. LCM of 7 and 9 is 63.
Number of cards that Cody gave Vincent
= 28 u - 18 u
= 10 u
10 u = 70
1 u = 70 ÷ 10 = 7
Number of cards that Vincent had at first
= 18 u
= 18 x 7
= 126
Answer(s): 126