PSLEThere were a total of 180 tables and benches in a basketball court. There were 2 times as many benches as tables. After 20 benches and some tables were removed, there were 4 times as many benches as tables left. How many tables were removed from the basketball court?
|
Tables |
Benches |
Total |
Before |
1 u |
2 u |
180 |
Change |
- ? |
- 20 |
|
After |
1 p |
4 p |
|
Total number of tables and benches
= 2 u + 1 u
= 3 u
3 u = 180
1 u = 180 ÷ 3 = 60
Number of benches at first
= 2 u
= 2 x 60
= 120
Number of benches left
= 120 - 20
= 100
4 p = 100
1 p = 100 ÷ 4 = 25
Number of tables removed from the basketball court
= 60 - 25
= 35
Answer(s): 35