PSLE A box contained yellow beads and grey beads. 60% of the beads were grey. After some brown beads were added to the box, 42% of the beads were grey. What percentage of the beads in the box were brown?
|
Grey |
Yellow |
Brown |
Total |
Before |
3 u |
2 u |
|
5 u |
Change |
|
|
+ ? |
|
After |
42% |
28% |
|
100% |
60% =
60100 =
35 The number of grey beads remains unchanged.
3 u → 42%
1 u → 42% ÷ 3 = 14%
2 u → 2 x 14 = 28%
Percentage of the beads in the box that were brown
= 100% - 42% - 28%
= 30%
Answer(s): 30%