There were some rows of tables in a canteen. Each row had 11 tables. When Betty brought in 8 extra tables and rearranged all the tables, there were 5 tables in each row and 4 more rows than before. How many tables were there at first?
| |
First
arrangement |
Second
arrangement |
| Number |
1 u |
1 u + 4 |
| Value |
11 |
5 |
| Total value |
11 u |
5 u + 20 |
If another 8 tables are added in the first arrangement, the total number of tables in the first arrangement and the second arrangement will be the same.
11 u + 8 = 5 u + 20
11 u - 5 u = 20 - 8
6 u = 12
1 u = 12 ÷ 6 = 2
Number of tables at first
= 11 u
= 11 x 2
= 22
Answer(s): 22
