There were some rows of benches in a parade square. Each row had 10 benches. When Jen brought in 5 extra benches and rearranged all the benches, there were 5 benches in each row and 3 more rows than before. How many benches were there at first?
| |
First
arrangement |
Second
arrangement |
| Number |
1 u |
1 u + 3 |
| Value |
10 |
5 |
| Total value |
10 u |
5 u + 15 |
If another 5 benches are added in the first arrangement, the total number of benches in the first arrangement and the second arrangement will be the same.
10 u + 5 = 5 u + 15
10 u - 5 u = 15 - 5
5 u = 10
1 u = 10 ÷ 5 = 2
Number of benches at first
= 10 u
= 10 x 2
= 20
Answer(s): 20
