PSLEThere were a total of 164 tables and chairs in a basketball court. There were 3 times as many chairs as tables. After 19 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 basketball court?
|
Tables |
Chairs |
Total |
Before |
1 u |
3 u |
164 |
Change |
- ? |
- 19 |
|
After |
1 p |
4 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 - 19
= 104
4 p = 104
1 p = 104 ÷ 4 = 26
Number of tables thrown away from the basketball court
= 41 - 26
= 15
Answer(s): 15