In the following questions each question is followed by data in the form of two statement  labelled as I and II. You must decide whether the data given in the statements are sufficient to answer the questions.

Question 4

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.

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