PSLE A box contained black beads and gold beads. 60% of the beads were gold. After some grey beads were added to the box, 39% of the beads were gold. What percentage of the beads in the box were grey?
|
Gold |
Black |
Grey |
Total |
Before |
3 u |
2 u |
|
5 u |
Change |
|
|
+ ? |
|
After |
39% |
26% |
|
100% |
60% =
60100 =
35 The number of gold beads remains unchanged.
3 u → 39%
1 u → 39% ÷ 3 = 13%
2 u → 2 x 13 = 26%
Percentage of the beads in the box that were grey
= 100% - 39% - 26%
= 35%
Answer(s): 35%