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2015-03-23T00:20:02+05:30

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Let the strength of the class be  N.      Let the cost per person be  Rs P.
Total cost = Rs  N * p = Rs 300.

As 5 of the students did not join the party,  the total cost
   Rs 300 = (N-5) * (p+2)
               = N p - 5 p + 2 N - 10
               = 300 - 5 p + 2 N - 10
   =>  5 p = 2 N - 10
   =>  5 * 300/N = 2 N - 10
  =>   N² - 5 N - 750 =  0
         (N - 30) (N + 25) = 0
           N = 30  as  N is positive.

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