Tammy gave 10% of her collection of stamps to Julie thereby increasing Julie's collection by 25%. If Tammy had 36 stamps left, how many stamps did Julie have at first?
| |
Tammy's stamps |
Julie's stamps |
| Before |
100% |
100 u |
| Change |
- 10% |
+ 10% = + 25 u |
| After |
90% |
125 u |
90% of Tammy's collection = 36
1% of Tammy's collection = 36 ÷ 90 = 0.4
10% of Tammy's collection = 10 x 0.4 = 4
25 u of Julie's collection = 4
1 u of Julie's collection =
416 = 0.16
100 u of Julie's collection = 100 x 0.16 = 16
Answer(s): 16
