Cindy and Penelope shared a box of erasers. Cindy had 90% of the total erasers. if Cindy gave 400 of her erasers to Penelope, both would have the same number of erasers. How many erasers did Cindy have?
| |
Cindy |
Penelope |
Total |
| Before |
90% |
10% |
100% |
| Change |
- 40% |
+ 40% |
|
| After |
50% |
50% |
100% |
Total number of erasers that Cindy and Penelope shared = 100%
If Cindy gave 400 erasers to Penelope, both would have the same number of erasers.
Number of erasers that each would have in the end
= 100% ÷ 2
= 50%
Number of erasers that Cindy gave to Penelope
= 90% - 50%
= 40%
40% → 400
1% → 400 ÷ 40 = 10
Number of erasers that Cindy had
= 90%
= 90 x 10
= 900
Answer(s): 900
