PSLEThere were a total of 160 tables and benches in a basketball court. There were 3 times as many benches as tables. After 15 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 |
160 |
Change |
- ? |
- 15 |
|
After |
1 p |
5 p |
|
Total number of tables and benches
= 3 u + 1 u
= 4 u
4 u = 160
1 u = 160 ÷ 4 = 40
Number of benches at first
= 3 u
= 3 x 40
= 120
Number of benches left
= 120 - 15
= 105
5 p = 105
1 p = 105 ÷ 5 = 21
Number of tables removed from the basketball court
= 40 - 21
= 19
Answer(s): 19