There were n boys and m girls in a class. They wanted to sit in a row for an activity. In how many ways can they sit on 30 chairs?

I. n+3m = 20

II. 2n + 2m = 22

Spoiler: OA

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Jun 18, 2018

There were n boys and m girls in a class. They wanted to sit in a row for an activity. In how many ways can they sit on 30 chairs?

To find the number of ways , we need the total number of students.

If N is total number of students, Number of ways will be

I. n+3m = 20

Value of (n, m) can be (2,6) or (5,5) or (8,4)

So N = n+m= 8 or 10 or 12.

NOT SUFFICIENT.

II. 2n + 2m = 22

N= n+m = 11