PSLEThere were a total of 168 tables and chairs in a parade square. There were 2 times as many chairs as tables. After 22 chairs and some tables were thrown away, there were 5 times as many chairs as tables left. How many tables were thrown away from the parade square?
|
Tables |
Chairs |
Total |
Before |
1 u |
2 u |
168 |
Change |
- ? |
- 22 |
|
After |
1 p |
5 p |
|
Number of tables and chairs at first
= 2 u + 1 u
= 168
3 u = 168
1 u = 168 ÷ 3 = 56
Number of chairs at first
= 2 u
= 2 x 56
= 112
Number of chairs left
= 112 - 22
= 90
5 p = 90
1 p = 90 ÷ 5 = 18
Number of tables thrown away from the parade square
= 56 - 18
= 38
Answer(s): 38