PSLEThere were a total of 123 tables and chairs in a canteen. There were 2 times as many chairs as tables. After 26 chairs and some tables were thrown away, there were 4 times as many chairs as tables left. How many tables were thrown away from the canteen?
|
Tables |
Chairs |
Total |
Before |
1 u |
2 u |
123 |
Change |
- ? |
- 26 |
|
After |
1 p |
4 p |
|
Number of tables and chairs at first
= 2 u + 1 u
= 123
3 u = 123
1 u = 123 ÷ 3 = 41
Number of chairs at first
= 2 u
= 2 x 41
= 82
Number of chairs left
= 82 - 26
= 56
4 p = 56
1 p = 56 ÷ 4 = 14
Number of tables thrown away from the canteen
= 41 - 14
= 27
Answer(s): 27