PSLEThere were a total of 198 tables and benches in a hall. There were 2 times as many benches as tables. After 12 benches and some tables were removed, there were 4 times as many benches as tables left. How many tables were removed from the hall?
|
Tables |
Benches |
Total |
Before |
1 u |
2 u |
198 |
Change |
- ? |
- 12 |
|
After |
1 p |
4 p |
|
Total number of tables and benches
= 2 u + 1 u
= 3 u
3 u = 198
1 u = 198 ÷ 3 = 66
Number of benches at first
= 2 u
= 2 x 66
= 132
Number of benches left
= 132 - 12
= 120
4 p = 120
1 p = 120 ÷ 4 = 30
Number of tables removed from the hall
= 66 - 30
= 36
Answer(s): 36