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  • Question
  • The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest numbers :


  • Options
  • A. 4
  • B. 8
  • C. 12
  • D. 16

  • Correct Answer


  • Explanation

    Let the numbers be x, x + 2, x + 4, x + 6 and x + 8.

    Then  [x + (x + 2) + (x + 4) + (x + 6) + (x + 8) ] / 5 = 61.

    or 5x + 20 = 305 or x = 57.

    So, required difference = (57 + 8) - 57  = 8


  • More questions

    • 1. The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:

    • Options
    • A. 1.2 km
    • B. 1.8 km
    • C. 2.4 km
    • D. 3.6 km
    • Discuss
    • 2. 
      3 glasses of capacity 2 liters, 5 liters and 9 liters contain mixture of milk and water with milk concentrations 90 %, 80 % and 70 % respectively. The contents of 3 glasses are emptied into a large vessel. Find the milk concentration and ratio of milk to water in the resultant mixture ?

    • Options
    • A. 121 : 39
    • B. 131 : 49
    • C. 39 : 121
    • D. 49 : 131
    • Discuss
    • 3. 
      The ratio of the ages of a father to that of their ages (in years) is 1000, then find the father's age after 10 yr.

    • Options
    • A. 50 yr
    • B. 60 yr
    • C. 80 yr
    • D. 100 yr
    • Discuss
    • 4. 
      If x = a ? b, y = b ? c, z = c ? a, then the numerical value of the algebraic expression x3 + y + z ? 3xyz will be

    • Options
    • A. a + b + c
    • B. 0
    • C. 4 (a + b + c)
    • D. 3 abc
    • Discuss
    • 5. Two pipes A and B can fill a cistern in 37½ minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after:

    • Options
    • A. 5 min.
    • B. 9 min.
    • C. 10 min.
    • D. 15 min.
    • Discuss
    • 6. 
      The average weight of 19 students is 15kg. by the admission of a new student the average weight is reduced to 14.8 kg. the weight of the new student is?

    • Options
    • A. 10.6 kg
    • B. 10.8 kg
    • C. 11 kg
    • D. 14.9 kg
    • Discuss
    • 7. 
      A certain amount was divided between Kavita and Reena in the ratio 4 : 3. If Reena's share was Rs. 2400. The amount is?

    • Options
    • A. Rs. 5600
    • B. Rs, 3200
    • C. Rs. 9600
    • D. None of these
    • Discuss
    • 8. On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is:

    • Options
    • A. 47619
    • B. 47719
    • C. 48619
    • D. 47649
    • Discuss
    • 9. 
      Internal length, breadth and height of a rectangular box are 10 cm, 8 cm and 6 cm, respectively. How many boxes are needed which can be packed in a cube whose volume is 6240 cu. cm.?

    • Options
    • A. 12
    • B. 13
    • C. 15
    • D. 17
    • Discuss
    • 10. 
      2 men and 1 woman can do a piece of work in 14 days, while 4 women and 2 men can do the same work in 8 days. If a men gets ? 90 per day, what should be the wages per day of a women?

    • Options
    • A. ? 48
    • B. ? 60
    • C. ? 72
    • D. ? 135
    • Discuss


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