PSLE At first, a container contained 86 pink marbles and some silver beads. After some pink marbles were removed,
38 of the marbles were silver. After 10 brown marbles were added to the container and now,
313 of the beads were silver. What was the number of pink marbles removed?
|
Silver marbles |
Pink marbles |
Brown marbles |
Total |
Before |
3 u |
86 |
0 |
|
Change 1 |
|
- ? |
|
+ ? |
After 1 |
3 u |
5 u |
0 |
8 u |
Change 2 |
|
|
+ 10 |
+ 5 u |
After 2 |
3 u |
5 u |
5 u |
13 u |
Some pink marbles were removed at first. However, when 10 brown marbles were added, the number of pink marbles remains unchanged.
Number of brown marbles added
= 13 u - 8 u
= 5 u
5 u = 10
1 u = 10 ÷ 5 = 2
Number of pink marbles removed
= 86 - 5 u
= 86 - 5 x 2
= 86 - 10
= 76
Answer(s): 76