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The following question is accompanied by two statements (I) and (II). You have to determine which statements(s) is/are sufficient/necessary to answer the questions. Find the ratio of girls and boys in a class where their average marks obtain in an examination is 50. I. Average marks of girls were 40 and average marks of boys were 60. II. Total marks obtained by girls were 1000.

The following question is accompanied by two statements (I) and (II). You have to determine which statements(s) is/are sufficient/necessary to answer the questions. Find the ratio of girls and boys in a class where their average marks obtain in an examination is 50. I. Average marks of girls were 40 and average marks of boys were 60. II. Total marks obtained by girls were 1000. Correct Answer if the statement I alone is sufficient to answer the question, but the statement II alone is not sufficient.

Using statement I

Using mixture and allegation

Ratio of girls and boys in the class

⇒ 10 : 10

⇒ 1 : 1

∴ statement I alone is sufficient to answer the question, but the statement II alone is not sufficient

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