PSLE A box contained gold balls and purple balls. 60% of the balls were purple. After some silver balls were added to the box, 18% of the balls were purple. What percentage of the balls in the box were silver?
|
Purple |
Gold |
Silver |
Total |
Before |
3 u |
2 u |
|
5 u |
Change |
|
|
+ ? |
|
After |
18% |
12% |
|
100% |
60% =
60100 =
35 The number of purple balls remains unchanged.
3 u → 18%
1 u → 18% ÷ 3 = 6%
2 u → 2 x 6 = 12%
Percentage of the balls in the box that were silver
= 100% - 18% - 12%
= 70%
Answer(s): 70%