PSLEThere were a total of 112 tables and benches in a canteen. There were 3 times as many benches as tables. After 16 benches and some tables were removed, there were 4 times as many benches as tables left. How many tables were removed from the canteen?
|
Tables |
Benches |
Total |
Before |
1 u |
3 u |
112 |
Change |
- ? |
- 16 |
|
After |
1 p |
4 p |
|
Total number of tables and benches
= 3 u + 1 u
= 4 u
4 u = 112
1 u = 112 ÷ 4 = 28
Number of benches at first
= 3 u
= 3 x 28
= 84
Number of benches left
= 84 - 16
= 68
4 p = 68
1 p = 68 ÷ 4 = 17
Number of tables removed from the canteen
= 28 - 17
= 11
Answer(s): 11