PSLEThere were a total of 123 tables and benches in a canteen. There were 2 times as many benches as tables. After 12 benches and some tables were removed, there were 5 times as many benches as tables left. How many tables were removed from the canteen?
|
Tables |
Benches |
Total |
Before |
1 u |
2 u |
123 |
Change |
- ? |
- 12 |
|
After |
1 p |
5 p |
|
Total number of tables and benches
= 2 u + 1 u
= 3 u
3 u = 123
1 u = 123 ÷ 3 = 41
Number of benches at first
= 2 u
= 2 x 41
= 82
Number of benches left
= 82 - 12
= 70
5 p = 70
1 p = 70 ÷ 5 = 14
Number of tables removed from the canteen
= 41 - 14
= 27
Answer(s): 27