Each member of a picnic party contributed twice as many rupees as the total number of members and the total collection was 3042 Rs. The number of members present in the party was :

Let the required number of persons be x.
According to the question, 2x^{2} = 3042
=> x^{2} = \frac{3042}{2}=1521
x = \sqrt{1521} = 39
Hence option [C] is right answer.