Multiple Choice Questions on The average earning of a mechanic for the first four days of a week is Rs 18 and for the last ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

The average earning of a mechanic for the first four days of a week is Rs 18 and for the last ...........

Quantitative Aptitude ( CCS) Average
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     The average earning of a mechanic for the first four days of a week is Rs.18 and for the last four days is Rs.22. If he earns Rs.20 on the fourth day, his average earning for the whole week is ?

    Rs. 18.95

    Incorrect Answer

    Rs. 16

    Incorrect Answer

    Rs. 20

    Correct Answer

    Rs. 25.71

    Incorrect Answer
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    Explanation:

     A+B+C+D = 18*4 = 72   ------>  (i)

    D+E+F+G = 22*4 = 88   -------> (ii)

    D = 20 ------> Put this in equ (i) and (ii) :-

    A+B+C = 52    -------> (iii)

    E+F+G = 68     ------> (iv)

    A+B+C+D+E+F+G = 52 + 68 +20 = 140

    The required average is :-

    140/7 = 20

    By: Deepak Dawra
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