PSLE A box contained white balls and pink balls. 30% of the balls were pink. After some blue balls were added to the box, 12% of the balls were pink. What percentage of the balls in the box were blue?
|
Pink |
White |
Blue |
Total |
Before |
3 u |
7 u |
|
10 u |
Change |
|
|
+ ? |
|
After |
12% |
28% |
|
100% |
30% =
30100 =
310 The number of pink balls remains unchanged.
3 u → 12%
1 u → 12% ÷ 3 = 4%
7 u → 7 x 4 = 28%
Percentage of the balls in the box that were blue
= 100% - 12% - 28%
= 60%
Answer(s): 60%