PSLEThere were a total of 153 tables and chairs in a hall. There were 2 times as many chairs as tables. After 27 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 hall?
|
Tables |
Chairs |
Total |
Before |
1 u |
2 u |
153 |
Change |
- ? |
- 27 |
|
After |
1 p |
5 p |
|
Number of tables and chairs at first
= 2 u + 1 u
= 153
3 u = 153
1 u = 153 ÷ 3 = 51
Number of chairs at first
= 2 u
= 2 x 51
= 102
Number of chairs left
= 102 - 27
= 75
5 p = 75
1 p = 75 ÷ 5 = 15
Number of tables thrown away from the hall
= 51 - 15
= 36
Answer(s): 36