PSLE A box contained white beads and blue beads. 60% of the beads were blue. After some black beads were added to the box, 24% of the beads were blue. What percentage of the beads in the box were black?
|
Blue |
White |
Black |
Total |
Before |
3 u |
2 u |
|
5 u |
Change |
|
|
+ ? |
|
After |
24% |
16% |
|
100% |
60% =
60100 =
35 The number of blue beads remains unchanged.
3 u → 24%
1 u → 24% ÷ 3 = 8%
2 u → 2 x 8 = 16%
Percentage of the beads in the box that were black
= 100% - 24% - 16%
= 60%
Answer(s): 60%