PSLEThere were a total of 164 tables and chairs in a tuckshop. There were 3 times as many chairs as tables. After 23 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 tuckshop?
|
Tables |
Chairs |
Total |
Before |
1 u |
3 u |
164 |
Change |
- ? |
- 23 |
|
After |
1 p |
5 p |
|
Number of tables and chairs at first
= 3 u + 1 u
= 164
4 u = 164
1 u = 164 ÷ 4 = 41
Number of chairs at first
= 3 u
= 3 x 41
= 123
Number of chairs left
= 123 - 23
= 100
5 p = 100
1 p = 100 ÷ 5 = 20
Number of tables thrown away from the tuckshop
= 41 - 20
= 21
Answer(s): 21