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MCQ Problem Solving - Averages

The CAT Online Free Test Prep MCQs Problem Solving - Averages

Problem Solving: Averages

Question:

The average of first five multiples of 3 is:
Option A:      8
Option B:      9
Option C:      10
Option D:      11
  A     B     C     D  
Show/Hide Answer and Explanation

Correct Answer: B

Explanation Video

Explanation

Basic Formula: 1,2,3...n

If n is odd, the formula is (n+1/2)th term

The five multiples of 3 is 3,6,9,12,15

(n+1/2)⇒(5+1/2)th term

⇒(6/2)th term = 3rd term

Here 3rd term is 9
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How to Solve Averages

For Averages question first understand the statement and the question stem. Try to solve and click the corresponding answer option. The drop down will appear to show the correct answer and explanation.