Eric and Dylan had the same number of stamps. Eric gave away
57 of his stamps while Dylan gave away
35 of his stamps. Given that Eric gave away 12 stamps more than Dylan, how many stamps did Eric have at first?
| |
Eric's stamps |
Dylan's stamps |
| Before |
7x5 =
35 u |
5x7 =
35 u |
| Change |
- 5x5 =
- 25 u |
- 3x7 =
- 21 u |
| After |
2x5 =
10 u |
2x7 =
14 u |
The number of cards that Eric and Dylan each had at first is the same. Make the number of cards that Eric and Dylan each had at first the same. LCM of 7 and 5 is 35.
Number of stamps that Eric gave away more than Dylan
= 25 u - 21 u
= 4 u
4 u = 12
1 u = 12 ÷ 4 = 3
Number of stamps that Eric had at first
= 35 u
= 35 x 3
= 105
Answer(s): 105
