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What is the average age of children in the class ? I. Age of the teacher is as many years as the number of children. II. Average age increased by 1 year if the teacher's age is also included. |
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Answer: Option D Explanation: Let there be x children. I gives, age of teacher = x years. II gives, average age of (x + 1) persons = (x + 1) years.
= (x + 1) (x + 1) - x2 = (x2 + 1 + 2x) - x2 = (1 + 2x) Thus, teacher's age cannot be obtained.
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Each of the questions given below consists of a statement and / or a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statement(s) is / are sufficient to answer the given question. Read the both statements and
Give answer (A) if the data in Statement I alone are sufficient to answer the question, while the data in Statement II alone are not sufficient to answer the question.
Give answer (B) if the data in Statement II alone are sufficient to answer the question, while the data in Statement I alone are not sufficient to answer the question.
Give answer (C) if the data either in Statement I or in Statement II alone are sufficient to answer the question.
Give answer (D) if the data even in both Statements I and II together are not sufficient to answer the question.
Give answer(E) if the data in both Statements I and II together are necessary to answer the question.
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