What is the total number of girls in the class?
I. Ratio of the number of boys to the number of girls in the class is 7 : 5
II. The average weight of girls in the class is 2 kg less than the average weight of boys in the class. The average weight of all the students of that class is 45 kgs.

A

If the statement I alone is sufficient to answer the question.

B

If the statement II alone is sufficient to answer the question.

C

If both the statement I and II alone are sufficient to answer the question but neither statement alone is sufficient

D

If both the statements I and II together are not sufficient to answer the question and additional data is required.