Jaslyn gave 10% of her collection of stamps to Gwen thereby increasing Gwen's collection by 20%. If Jaslyn had 54 stamps left, how many stamps did Gwen have at first?
| |
Jaslyn's stamps |
Gwen's stamps |
| Before |
100% |
100 u |
| Change |
- 10% |
+ 10% = + 20 u |
| After |
90% |
120 u |
90% of Jaslyn's collection = 54
1% of Jaslyn's collection = 54 ÷ 90 = 0.6
10% of Jaslyn's collection = 10 x 0.6 = 6
20 u of Gwen's collection = 6
1 u of Gwen's collection =
630 = 0.3
100 u of Gwen's collection = 100 x 0.3 = 30
Answer(s): 30
