Gwen had 30 more stamps than Vanessa. After Vanessa gave away
13 of her stamps, Gwen had four times as many stamps as Vanessa. How many stamps did Vanessa have at first?
| |
Gwen |
Vanessa |
Comparing Gwen and
Vanessa at first |
30 more |
|
| Before |
8 u |
3 u |
| Change |
|
- 1 u |
| After |
8 u |
2 u |
Comparing Gwen and
Vanessa in the end |
4x2 =
8 u |
1x2 =
2 u |
Number of stamps that Vanessa had in the end is repeated. Make the number of stamps that Vanessa had in the end the same. LCM of 1 and 2 is 2.
Number of stamps that Gwen had at first = 8 u
Number of stamps that Gwen had more than Vanessa at first
= 8 u - 3 u
= 5 u
5 u = 30
1 u = 30 ÷ 5 = 6
Number of stamps that Vanessa had at first
= 3 u
= 3 x 6
= 18
Answer(s): 18
