PSLE At first, a container contained 94 white marbles and some green beads. After some white marbles were removed,
25 of the marbles were green. After 32 black marbles were added to the container and now,
27 of the beads were green. What was the number of white marbles removed?
|
Green marbles |
White marbles |
Black marbles |
Total |
Before |
2 u |
94 |
0 |
|
Change 1 |
|
- ? |
|
+ ? |
After 1 |
2 u |
3 u |
0 |
5 u |
Change 2 |
|
|
+ 32 |
+ 2 u |
After 2 |
2 u |
3 u |
2 u |
7 u |
Some white marbles were removed at first. However, when 32 black marbles were added, the number of white marbles remains unchanged.
Number of black marbles added
= 7 u - 5 u
= 2 u
2 u = 32
1 u = 32 ÷ 2 = 16
Number of white marbles removed
= 94 - 3 u
= 94 - 3 x 16
= 94 - 48
= 46
Answer(s): 46