PSLEThere were a total of 116 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 4 times as many benches as tables left. How many tables were removed from the basketball court?
|
Tables |
Benches |
Total |
Before |
1 u |
3 u |
116 |
Change |
- ? |
- 15 |
|
After |
1 p |
4 p |
|
Total number of tables and benches
= 3 u + 1 u
= 4 u
4 u = 116
1 u = 116 ÷ 4 = 29
Number of benches at first
= 3 u
= 3 x 29
= 87
Number of benches left
= 87 - 15
= 72
4 p = 72
1 p = 72 ÷ 4 = 18
Number of tables removed from the basketball court
= 29 - 18
= 11
Answer(s): 11