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.
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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