Eric had
25 the number of cards that Rael had at first. After Rael gave Eric 110 of his cards, Eric had
45 the number of cards that Rael had. How many cards did Eric have at first?
|
Eric |
Rael |
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 Eric and Rael 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 Rael gave Eric
= 28 u - 18 u
= 10 u
10 u = 110
1 u = 110 ÷ 10 = 11
Number of cards that Eric had at first
= 18 u
= 18 x 11
= 198
Answer(s): 198