PSLEThere were a total of 108 tables and benches in a parade square. There were 3 times as many benches as tables. After 17 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 |
3 u |
108 |
Change |
- ? |
- 17 |
|
After |
1 p |
4 p |
|
Total number of tables and benches
= 3 u + 1 u
= 4 u
4 u = 108
1 u = 108 ÷ 4 = 27
Number of benches at first
= 3 u
= 3 x 27
= 81
Number of benches left
= 81 - 17
= 64
4 p = 64
1 p = 64 ÷ 4 = 16
Number of tables removed from the parade square
= 27 - 16
= 11
Answer(s): 11