PSLEThere were a total of 177 tables and benches in a parade square. There were 2 times as many benches as tables. After 18 benches and some tables were removed, there were 5 times as many benches as tables left. How many tables were removed from the parade square?
|
Tables |
Benches |
Total |
Before |
1 u |
2 u |
177 |
Change |
- ? |
- 18 |
|
After |
1 p |
5 p |
|
Total number of tables and benches
= 2 u + 1 u
= 3 u
3 u = 177
1 u = 177 ÷ 3 = 59
Number of benches at first
= 2 u
= 2 x 59
= 118
Number of benches left
= 118 - 18
= 100
5 p = 100
1 p = 100 ÷ 5 = 20
Number of tables removed from the parade square
= 59 - 20
= 39
Answer(s): 39