Nora gave 15% of her collection of pens to Natalie thereby increasing Natalie's collection by 30%. If Nora had 51 pens left, how many pens did Natalie have at first?
| |
Nora's pens |
Natalie's pens |
| Before |
100% |
100 u |
| Change |
- 15% |
+ 15% = + 30 u |
| After |
85% |
130 u |
85% of Nora's collection = 51
1% of Nora's collection = 51 ÷ 85 = 0.6
15% of Nora's collection = 15 x 0.6 = 9
30 u of Natalie's collection = 9
1 u of Natalie's collection =
930 = 0.3
100 u of Natalie's collection = 100 x 0.3 = 30
Answer(s): 30
