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The following question consists of three statements I, II and III are given below. You have to decide whether the data provided in the statements are sufficient to answer the question.

What is the average age of 45 students studying while in a class?

I. The average age of boys is 15.4 years while the average age of girls is 14.6 years.

II. Boys and girls are respectively in the ratio is 4 : 5.

III. The number of boys is less than that of girls by 5.

(a) I and II only           (b) I and III only         (c) All I, II and III          (d) I and either II and III


Question ID - 51472 | SaraNextGen Top Answer

The following question consists of three statements I, II and III are given below. You have to decide whether the data provided in the statements are sufficient to answer the question.

What is the average age of 45 students studying while in a class?

I. The average age of boys is 15.4 years while the average age of girls is 14.6 years.

II. Boys and girls are respectively in the ratio is 4 : 5.

III. The number of boys is less than that of girls by 5.

(a) I and II only           (b) I and III only         (c) All I, II and III          (d) I and either II and III

1 Answer
127 votes
Answer Key / Explanation : (d) -

From I and II,

Let the number of boys and girls be  and  respectively.

Then,

So, the number of boys = 20; number of girls = 25.

Average age of students =  yrs.

Thus, I and II together give the answer.

From I and III, we have

Let the number of boys=

Then,

So, the number of girls = 25, number of boys = 20.

As calculated above, required average = 14.96 yrs.

Thus I and II together also give the answer.

127 votes

127
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