PSLE At first, a box contained 83 blue beads and some green beads. After some blue beads were removed,
25 of the beads were green. After 34 black beads were added to the box and now,
27 of the beads were green. What was the number of blue beads removed?
|
Green beads |
Blue beads |
Black beads |
Total |
Before |
2 u |
83 |
0 |
|
Change 1 |
|
- ? |
|
+ ? |
After 1 |
2 u |
3 u |
0 |
5 u |
Change 2 |
|
|
+ 34 |
+ 2 u |
After 2 |
2 u |
3 u |
2 u |
7 u |
Some blue beads were removed at first. However, when 34 black beads were added, the number of blue beads remains unchanged.
Number of black beads added
= 7 u - 5 u
= 2 u
2 u = 34
1 u = 34 ÷ 2 = 17
Number of blue beads removed
= 83 - 3 u
= 83 - 3 x 17
= 83 - 51
= 32
Answer(s): 32