PSLEThere were a total of 100 tables and benches in a basketball court. There were 3 times as many benches as tables. After 20 benches and some tables were removed, there were 5 times as many benches as tables left. How many tables were removed from the basketball court?
|
Tables |
Benches |
Total |
Before |
1 u |
3 u |
100 |
Change |
- ? |
- 20 |
|
After |
1 p |
5 p |
|
Total number of tables and benches
= 3 u + 1 u
= 4 u
4 u = 100
1 u = 100 ÷ 4 = 25
Number of benches at first
= 3 u
= 3 x 25
= 75
Number of benches left
= 75 - 20
= 55
5 p = 55
1 p = 55 ÷ 5 = 11
Number of tables removed from the basketball court
= 25 - 11
= 14
Answer(s): 14