There were some rows of chairs in a parade square. Each row had 7 chairs. When Gabby brought in 3 extra chairs and rearranged all the chairs, there were 5 chairs in each row and 5 more rows than before. How many chairs were there at first?
| |
First
arrangement |
Second
arrangement |
| Number |
1 u |
1 u + 5 |
| Value |
7 |
5 |
| Total value |
7 u |
5 u + 25 |
If another 3 chairs are added in the first arrangement, the total number of chairs in the first arrangement and the second arrangement will be the same.
7 u + 3 = 5 u + 25
7 u - 5 u = 25 - 3
2 u = 22
1 u = 22 ÷ 2 = 11
Number of chairs at first
= 7 u
= 7 x 11
= 77
Answer(s): 77
