PSLEThere were a total of 124 tables and chairs in a parade square. There were 3 times as many chairs as tables. After 28 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 parade square?
|
Tables |
Chairs |
Total |
Before |
1 u |
3 u |
124 |
Change |
- ? |
- 28 |
|
After |
1 p |
5 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 - 28
= 65
5 p = 65
1 p = 65 ÷ 5 = 13
Number of tables thrown away from the parade square
= 31 - 13
= 18
Answer(s): 18