Question

What is the smallest number of chairs that can be arranged in rows of 9 or 15​

Answer 1

Answer:

chairs after they were rearranged in rows of 10. So the number

of chairs when they were arranged in rows of 15 must equal the

number of chairs when they were arranged in rows of 10. So the

equation is:

15N = 10(N+4)+5

15N = 10N+40+5

15N = 10N+45

5N = 45

N = 9

Checking:

There were 9 row of 15 each in the beginning, which is 9×15 or 135 chairs

Then when they were arranged in 9+4 or 13 rows of 10 each, those rows

contained 13×10 or 130 chairs, and the 5