There were some rows of stools in a parade square. Each row had 9 stools. When Betty brought in 3 extra stools and rearranged all the stools, there were 6 stools in each row and 3 more rows than before. How many stools were there at first?
| |
First
arrangement |
Second
arrangement |
| Number |
1 u |
1 u + 3 |
| Value |
9 |
6 |
| Total value |
9 u |
6 u + 18 |
If another 3 stools are added in the first arrangement, the total number of stools in the first arrangement and the second arrangement will be the same.
9 u + 3 = 6 u + 18
9 u - 6 u = 18 - 3
3 u = 15
1 u = 15 ÷ 3 = 5
Number of stools at first
= 9 u
= 9 x 5
= 45
Answer(s): 45
