There were some rows of chairs in a school field. Each row had 11 chairs. When Sabrina brought in 2 extra chairs and rearranged all the chairs, there were 5 chairs in each row and 4 more rows than before. How many chairs 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 2 chairs are added in the first arrangement, the total number of chairs in the first arrangement and the second arrangement will be the same.
11 u + 2 = 5 u + 20
11 u - 5 u = 20 - 2
6 u = 18
1 u = 18 ÷ 6 = 3
Number of chairs at first
= 11 u
= 11 x 3
= 33
Answer(s): 33
