The average of five positive numbers is 213. The average of the first two numbers is 233.5 and the average of last two numbers is 271. What is the third number?

(a) 64 (b) 56 (c) 106 (d) Cannot be determined (e) None of these

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  • 56
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  • The sum of five numbers = 5*213=1065 The sum of first two numbers = 2*233.5=467.0 The sum of the last two numbers=271*2=542 Third number = 1065-(467+542) =56
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  • Ans is option (b) 56
    Explanation:
    The sum of the five numbers = 5 × 213 =1065
    The sum of the first two numbers = 2 × 233.5 = 467
    The sum of  the last two numbers = 542
    Then the sum of the four numbers = 467 + 542 =1009
    So, the third number will be = 1065 – 1009
                                             = 56
    0
  • The sum of the five numbers = 5 × 213 =1065
    The sum of the first two numbers = 2 × 233.5 = 467
    The sum of  the last two numbers = 542
    Then the sum of the four numbers = 467 + 542 =1009
    So, the third number will be = 1065 – 1009 = 56. Ans.
    0
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