PSLEThere were a total of 141 tables and benches in a canteen. There were 2 times as many benches as tables. After 18 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 |
2 u |
141 |
Change |
- ? |
- 18 |
|
After |
1 p |
4 p |
|
Total number of tables and benches
= 2 u + 1 u
= 3 u
3 u = 141
1 u = 141 ÷ 3 = 47
Number of benches at first
= 2 u
= 2 x 47
= 94
Number of benches left
= 94 - 18
= 76
4 p = 76
1 p = 76 ÷ 4 = 19
Number of tables removed from the canteen
= 47 - 19
= 28
Answer(s): 28