PSLE At first, a container contained 58 silver beads and some blue beads. After some silver beads were removed,
25 of the beads were blue. After 14 grey beads were added to the container and now,
27 of the beads were blue. What was the number of silver beads removed?
|
Blue beads |
Silver beads |
Grey beads |
Total |
Before |
2 u |
58 |
0 |
|
Change 1 |
|
- ? |
|
+ ? |
After 1 |
2 u |
3 u |
0 |
5 u |
Change 2 |
|
|
+ 14 |
+ 2 u |
After 2 |
2 u |
3 u |
2 u |
7 u |
Some silver beads were removed at first. However, when 14 grey beads were added, the number of silver beads remains unchanged.
Number of grey beads added
= 7 u - 5 u
= 2 u
2 u = 14
1 u = 14 ÷ 2 = 7
Number of silver beads removed
= 58 - 3 u
= 58 - 3 x 7
= 58 - 21
= 37
Answer(s): 37