PSLE At first, a container contained 87 yellow beads and some grey beads. After some yellow beads were removed,
47 of the beads were grey. After 96 silver beads were added to the container and now,
413 of the beads were grey. What was the number of yellow beads removed?
|
Grey beads |
Yellow beads |
Silver beads |
Total |
Before |
4 u |
87 |
0 |
|
Change 1 |
|
- ? |
|
+ ? |
After 1 |
4 u |
3 u |
0 |
7 u |
Change 2 |
|
|
+ 96 |
+ 6 u |
After 2 |
4 u |
3 u |
6 u |
13 u |
Some yellow beads were removed at first. However, when 96 silver beads were added, the number of yellow beads remains unchanged.
Number of silver beads added
= 13 u - 7 u
= 6 u
6 u = 96
1 u = 96 ÷ 6 = 16
Number of yellow beads removed
= 87 - 3 u
= 87 - 3 x 16
= 87 - 48
= 39
Answer(s): 39