PSLEThere were a total of 104 tables and chairs in a school field. There were 3 times as many chairs as tables. After 26 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 school field?
|
Tables |
Chairs |
Total |
Before |
1 u |
3 u |
104 |
Change |
- ? |
- 26 |
|
After |
1 p |
4 p |
|
Number of tables and chairs at first
= 3 u + 1 u
= 104
4 u = 104
1 u = 104 ÷ 4 = 26
Number of chairs at first
= 3 u
= 3 x 26
= 78
Number of chairs left
= 78 - 26
= 52
4 p = 52
1 p = 52 ÷ 4 = 13
Number of tables thrown away from the school field
= 26 - 13
= 13
Answer(s): 13