PSLE At first, a container contained 70 brown beads and some yellow beads. After some brown beads were removed,
37 of the beads were yellow. After 16 red beads were added to the container and now,
311 of the beads were yellow. What was the number of brown beads removed?
|
Yellow beads |
Brown beads |
Red beads |
Total |
Before |
3 u |
70 |
0 |
|
Change 1 |
|
- ? |
|
+ ? |
After 1 |
3 u |
4 u |
0 |
7 u |
Change 2 |
|
|
+ 16 |
+ 4 u |
After 2 |
3 u |
4 u |
4 u |
11 u |
Some brown beads were removed at first. However, when 16 red beads were added, the number of brown beads remains unchanged.
Number of red beads added
= 11 u - 7 u
= 4 u
4 u = 16
1 u = 16 ÷ 4 = 4
Number of brown beads removed
= 70 - 4 u
= 70 - 4 x 4
= 70 - 16
= 54
Answer(s): 54