PSLEThere were a total of 172 tables and chairs in a tuckshop. There were 3 times as many chairs as tables. After 14 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 |
172 |
Change |
- ? |
- 14 |
|
After |
1 p |
5 p |
|
Number of tables and chairs at first
= 3 u + 1 u
= 172
4 u = 172
1 u = 172 ÷ 4 = 43
Number of chairs at first
= 3 u
= 3 x 43
= 129
Number of chairs left
= 129 - 14
= 115
5 p = 115
1 p = 115 ÷ 5 = 23
Number of tables thrown away from the tuckshop
= 43 - 23
= 20
Answer(s): 20