PSLEThere were a total of 132 tables and benches in a school field. There were 3 times as many benches as tables. After 19 benches and some tables were removed, there were 5 times as many benches as tables left. How many tables were removed from the school field?
|
Tables |
Benches |
Total |
Before |
1 u |
3 u |
132 |
Change |
- ? |
- 19 |
|
After |
1 p |
5 p |
|
Total number of tables and benches
= 3 u + 1 u
= 4 u
4 u = 132
1 u = 132 ÷ 4 = 33
Number of benches at first
= 3 u
= 3 x 33
= 99
Number of benches left
= 99 - 19
= 80
5 p = 80
1 p = 80 ÷ 5 = 16
Number of tables removed from the school field
= 33 - 16
= 17
Answer(s): 17