Barbara gave 10% of her collection of beads to Lucy thereby increasing Lucy's collection by 25%. If Barbara had 45 beads left, how many beads did Lucy have at first?
| |
Barbara's beads |
Lucy's beads |
| Before |
100% |
100 u |
| Change |
- 10% |
+ 10% = + 25 u |
| After |
90% |
125 u |
90% of Barbara's collection = 45
1% of Barbara's collection = 45 ÷ 90 = 0.5
10% of Barbara's collection = 10 x 0.5 = 5
25 u of Lucy's collection = 5
1 u of Lucy's collection =
520 = 0.2
100 u of Lucy's collection = 100 x 0.2 = 20
Answer(s): 20
