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  • Question

  • 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?


  • Options
  • A. Rs . 18.95
  • B. Rs 16
  • C. Rs. 20
  • D. Rs. 25.71

  • Correct Answer
  • Rs. 20 

    Explanation

    Total earning for the week = Sum of earning of first four days + Sum of earning of last four days - Earning of 4th day
    = 4 x18 + 4 x 22 -20
    = Rs. 140

    ? Average earning = 140 / 7
    = Rs. 20

    • More questions

    • 1. If cos3A = X, then value of X?

    • Options
    • A. 4cos3A - 3cosA
    • B. 4cos3A + 3cosA
    • C. 3cosA - 4cos3A
    • D. cosA + 4cos3A
      • Discuss
    • 2. By investing Rs. 1620 in 8% stock, Michael earns Rs. 135. The stock is then quoted at ?

    • Options
    • A. Rs. 145
    • B. Rs. 245.1
    • C. Rs. 96
    • D. Rs. 75
      • Discuss
    • 3. In ?XYZ measure of angle Y is 90 deg. If cosecX = 13/12, and XY = 1cm, then what is the length ( in cm ) of side YZ?

    • Options
    • A. 2.6
    • B. 1.5
    • C. 2.4
    • D. 2
      • Discuss
    • 4. Which is better investment : 11% stock at 143 (or) 9 3/4% stock at 117 ?

    • Options
    • A. Both are equally good
    • B. 9 3/4% stock at 117
    • C. Cannot be compared, as the total amount of investment is not given
    • D. 11% stock at 143
      • Discuss
    • 5. XYZ is a right angled triangle and ?Y = 90°. If XY = 2.5 cm and YZ = 6 cm then the circumradius of ?XYZ is

    • Options
    • A. 6.5 cm
    • B. 3.25 cm
    • C. 3 cm
    • D. 2.5 cm
      • Discuss
    • 6. A man invested Rs. 4455 in Rs. 10 shares quoted at Rs. 8.25. If the rate of dividend be 12%, his annual income is:

    • Options
    • A. 107.04
    • B. 648
    • C. 500
    • D. 648.60
      • Discuss
    • 7. If x + 1/x = 6, then value of x2 + 1/x2 is

    • Options
    • A. 23
    • B. 16
    • C. 34
    • D. 32
      • Discuss
    • 8. Find the cost of 96 shares of Rs. 10 each at 34 discount, brokerage being 1/4 per share.

    • Options
    • A. 912
    • B. 921
    • C. 920
    • D. 900
      • Discuss
    • 9. If 14/3 + (1/2)(x - 7/3) = -2x/3, then the value of x is?

    • Options
    • A. -3
    • B. 3
    • C. -6
    • D. 6
      • Discuss
    • 10. The cash realised on selling a 14% stock is Rs.106.25, brokerage being 1/4% is

    • Options
    • A. 123
    • B. 106
    • C. 100
    • D. 156
      • Discuss

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