PSLEThere were a total of 168 tables and benches in a parade square. 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 parade square?
|
Tables |
Benches |
Total |
Before |
1 u |
2 u |
168 |
Change |
- ? |
- 12 |
|
After |
1 p |
5 p |
|
Total number of tables and benches
= 2 u + 1 u
= 3 u
3 u = 168
1 u = 168 ÷ 3 = 56
Number of benches at first
= 2 u
= 2 x 56
= 112
Number of benches left
= 112 - 12
= 100
5 p = 100
1 p = 100 ÷ 5 = 20
Number of tables removed from the parade square
= 56 - 20
= 36
Answer(s): 36