PSLE A box contained red marbles and white marbles. 40% of the marbles were white. After some brown marbles were added to the box, 14% of the marbles were white. What percentage of the marbles in the box were brown?
|
White |
Red |
Brown |
Total |
Before |
2 u |
3 u |
|
5 u |
Change |
|
|
+ ? |
|
After |
14% |
21% |
|
100% |
40% =
40100 =
25 The number of white marbles remains unchanged.
2 u → 14%
1 u → 14% ÷ 2 = 7%
3 u → 3 x 7 = 21%
Percentage of the marbles in the box that were brown
= 100% - 14% - 21%
= 65%
Answer(s): 65%