PSLEThere were a total of 176 tables and chairs in a tuckshop. There were 3 times as many chairs as tables. After 20 chairs and some tables were thrown away, there were 4 times as many chairs as tables left. How many tables were thrown away from the tuckshop?
|
Tables |
Chairs |
Total |
Before |
1 u |
3 u |
176 |
Change |
- ? |
- 20 |
|
After |
1 p |
4 p |
|
Number of tables and chairs at first
= 3 u + 1 u
= 176
4 u = 176
1 u = 176 ÷ 4 = 44
Number of chairs at first
= 3 u
= 3 x 44
= 132
Number of chairs left
= 132 - 20
= 112
4 p = 112
1 p = 112 ÷ 4 = 28
Number of tables thrown away from the tuckshop
= 44 - 28
= 16
Answer(s): 16