PSLE At first, a container contained 61 yellow beads and some blue beads. After some yellow beads were removed,
58 of the beads were blue. After 48 brown beads were added to the container and now,
511 of the beads were blue. What was the number of yellow beads removed?
|
Blue beads |
Yellow beads |
Brown beads |
Total |
Before |
5 u |
61 |
0 |
|
Change 1 |
|
- ? |
|
+ ? |
After 1 |
5 u |
3 u |
0 |
8 u |
Change 2 |
|
|
+ 48 |
+ 3 u |
After 2 |
5 u |
3 u |
3 u |
11 u |
Some yellow beads were removed at first. However, when 48 brown beads were added, the number of yellow beads remains unchanged.
Number of brown beads added
= 11 u - 8 u
= 3 u
3 u = 48
1 u = 48 ÷ 3 = 16
Number of yellow beads removed
= 61 - 3 u
= 61 - 3 x 16
= 61 - 48
= 13
Answer(s): 13