PSLE A box contained blue beads and black beads. 40% of the beads were black. After some purple beads were added to the box, 8% of the beads were black. What percentage of the beads in the box were purple?
|
Black |
Blue |
Purple |
Total |
Before |
2 u |
3 u |
|
5 u |
Change |
|
|
+ ? |
|
After |
8% |
12% |
|
100% |
40% =
40100 =
25 The number of black beads remains unchanged.
2 u → 8%
1 u → 8% ÷ 2 = 4%
3 u → 3 x 4 = 12%
Percentage of the beads in the box that were purple
= 100% - 8% - 12%
= 80%
Answer(s): 80%