PSLE A box contained red beads and yellow beads. 40% of the beads were yellow. After some white beads were added to the box, 32% of the beads were yellow. What percentage of the beads in the box were white?
|
Yellow |
Red |
White |
Total |
Before |
2 u |
3 u |
|
5 u |
Change |
|
|
+ ? |
|
After |
32% |
48% |
|
100% |
40% =
40100 =
25 The number of yellow beads remains unchanged.
2 u → 32%
1 u → 32% ÷ 2 = 16%
3 u → 3 x 16 = 48%
Percentage of the beads in the box that were white
= 100% - 32% - 48%
= 20%
Answer(s): 20%