Opal and Irene shared a box of marbles. Opal had 80% of the total marbles. if Opal gave 90 of her marbles to Irene, both would have the same number of marbles. How many marbles did Irene have?
| |
Opal |
Irene |
Total |
| Before |
80% |
20% |
100% |
| Change |
- 30% |
+ 30% |
|
| After |
50% |
50% |
100% |
Total number of marbles that Opal and Irene shared = 100%
If Opal gave 90 marbles to Irene, both would have the same number of marbles.
Number of marbles that each would have in the end
= 100% ÷ 2
= 50%
Number of marbles that Opal gave to Irene
= 80% - 50%
= 30%
30% → 90
1% → 90 ÷ 30 = 3
Number of marbles that Irene had
= 20%
= 20 x 3
= 60
Answer(s): 60
