Multiple Choice Questions on The average age of some males and 15 females is 18 years The sum of the ages of 15 females is 240 ye........... for Employee State Insurance Corporation (ESIC) Exam Preparation

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Multiple Choice Questions

The average age of some males and 15 females is 18 years The sum of the ages of 15 females is 240 ye...........

Numerical Ability Average
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    The average age of some males and 15 females is 18 years. The sum of the ages of 15 females is 240 years and average age of males is 20years. Find the number of males.

    8

    Incorrect Answer

    7

    Incorrect Answer

    10

    Incorrect Answer

    15

    Correct Answer
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    Explanation:

    Let the number of males be x,
    ∴ 18 = (x × 20 + 240)/(x + 15)
    = 18x + 270 = 20x + 240
    = 20x – 18 = 270 – 240
    = 2x = 30
    x = 30/2 = 15

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