PSLE A box contained yellow balls and black balls. 60% of the balls were black. After some pink balls were added to the box, 9% of the balls were black. What percentage of the balls in the box were pink?
|
Black |
Yellow |
Pink |
Total |
Before |
3 u |
2 u |
|
5 u |
Change |
|
|
+ ? |
|
After |
9% |
6% |
|
100% |
60% =
60100 =
35 The number of black balls remains unchanged.
3 u → 9%
1 u → 9% ÷ 3 = 3%
2 u → 2 x 3 = 6%
Percentage of the balls in the box that were pink
= 100% - 9% - 6%
= 85%
Answer(s): 85%