There were some rows of stools in a parade square. Each row had 9 stools. When Jean brought in 4 extra stools and rearranged all the stools, there were 5 stools in each row and 4 more rows than before. How many stools were there at first?
|
First arrangement |
Second arrangement |
Number |
1 u |
1 u + 4 |
Value |
9 |
5 |
Total value |
9 u |
5 u + 20 |
If another 4 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 + 4 = 5 u + 20
9 u - 5 u = 20 - 4
4 u = 16
1 u = 16 ÷ 4 = 4
Number of stools at first
= 9 u
= 9 x 4
= 36
Answer(s): 36