PSLEThere were a total of 124 tables and chairs in a basketball court. There were 3 times as many chairs as tables. After 25 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 |
124 |
Change |
- ? |
- 25 |
|
After |
1 p |
4 p |
|
Number of tables and chairs at first
= 3 u + 1 u
= 124
4 u = 124
1 u = 124 ÷ 4 = 31
Number of chairs at first
= 3 u
= 3 x 31
= 93
Number of chairs left
= 93 - 25
= 68
4 p = 68
1 p = 68 ÷ 4 = 17
Number of tables thrown away from the basketball court
= 31 - 17
= 14
Answer(s): 14