There were some rows of chairs in a school field. Each row had 8 chairs. When Xuan brought in 6 extra chairs and rearranged all the chairs, there were 5 chairs in each row and 3 more rows than before. How many chairs were there at first?
| |
First
arrangement |
Second
arrangement |
| Number |
1 u |
1 u + 3 |
| Value |
8 |
5 |
| Total value |
8 u |
5 u + 15 |
If another 6 chairs are added in the first arrangement, the total number of chairs in the first arrangement and the second arrangement will be the same.
8 u + 6 = 5 u + 15
8 u - 5 u = 15 - 6
3 u = 9
1 u = 9 ÷ 3 = 3
Number of chairs at first
= 8 u
= 8 x 3
= 24
Answer(s): 24
