Help me solve this:

A group of 630 children are arranged for a group photograph session. Each row contains three fewer children than the row infront of it. What is the possible number of rows?

Hi Avantika,

Let the number of children in the last row be 'and the number of rows be 'n'.

Now, we have an A.P with a common difference, d = 3.

We know that the sum of A.P = (0.5n)(2a+(n-1)d) 

0.5n(2a+(n-1)d) = 630

2an + 3n^2-3n = 1260

Since the equation contains 2 unknown variables, it has infinite number of solutions.

You can take CAT quotient tests to practice problems daily.