PSLEThere were a total of 120 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 4 times as many benches as tables left. How many tables were removed from the parade square?
|
Tables |
Benches |
Total |
Before |
1 u |
2 u |
120 |
Change |
- ? |
- 12 |
|
After |
1 p |
4 p |
|
Total number of tables and benches
= 2 u + 1 u
= 3 u
3 u = 120
1 u = 120 ÷ 3 = 40
Number of benches at first
= 2 u
= 2 x 40
= 80
Number of benches left
= 80 - 12
= 68
4 p = 68
1 p = 68 ÷ 4 = 17
Number of tables removed from the parade square
= 40 - 17
= 23
Answer(s): 23