There were some rows of tables in a hall. Each row had 9 tables. When Pamela brought in 21 extra tables and rearranged all the tables, there were 6 tables in each row and 5 more rows than before. How many tables were there at first?
| |
First
arrangement |
Second
arrangement |
| Number |
1 u |
1 u + 5 |
| Value |
9 |
6 |
| Total value |
9 u |
6 u + 30 |
If another 21 tables are added in the first arrangement, the total number of tables in the first arrangement and the second arrangement will be the same.
9 u + 21 = 6 u + 30
9 u - 6 u = 30 - 21
3 u = 9
1 u = 9 ÷ 3 = 3
Number of tables at first
= 9 u
= 9 x 3
= 27
Answer(s): 27
