PSLEThere were a total of 174 tables and chairs in a hall. There were 2 times as many chairs as tables. After 16 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 |
174 |
Change |
- ? |
- 16 |
|
After |
1 p |
5 p |
|
Number of tables and chairs at first
= 2 u + 1 u
= 174
3 u = 174
1 u = 174 ÷ 3 = 58
Number of chairs at first
= 2 u
= 2 x 58
= 116
Number of chairs left
= 116 - 16
= 100
5 p = 100
1 p = 100 ÷ 5 = 20
Number of tables thrown away from the hall
= 58 - 20
= 38
Answer(s): 38