Joelle gave 14% of her collection of marbles to Dana thereby increasing Dana's collection by 25%. If Joelle had 43 marbles left, how many marbles did Dana have at first?
| |
Joelle's marbles |
Dana's marbles |
| Before |
100% |
100 u |
| Change |
- 14% |
+ 14% = + 25 u |
| After |
86% |
125 u |
86% of Joelle's collection = 43
1% of Joelle's collection = 43 ÷ 86 = 0.5
14% of Joelle's collection = 14 x 0.5 = 7
25 u of Dana's collection = 7
1 u of Dana's collection =
728 = 0.28
100 u of Dana's collection = 100 x 0.28 = 28
Answer(s): 28
