Seth and Peter had the same number of stamps. Seth gave away
45 of his stamps while Peter gave away
23 of his stamps. Given that Seth gave away 12 stamps more than Peter, how many stamps did Seth have at first?
| |
Seth's stamps |
Peter's stamps |
| Before |
5x3 =
15 u |
3x5 =
15 u |
| Change |
- 4x3 =
- 12 u |
- 2x5 =
- 10 u |
| After |
1x3 =
3 u |
1x5 =
5 u |
The number of cards that Seth and Peter each had at first is the same. Make the number of cards that Seth and Peter each had at first the same. LCM of 5 and 3 is 15.
Number of stamps that Seth gave away more than Peter
= 12 u - 10 u
= 2 u
2 u = 12
1 u = 12 ÷ 2 = 6
Number of stamps that Seth had at first
= 15 u
= 15 x 6
= 90
Answer(s): 90
