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  • Question
  • Average weight of 19 men is 74 kg and the average weight of 38 women is 63 kg. What is the average weight(rounded off to the nearest integer) of all the men and the women together.


  • Options
  • A. 59 kg
  • B. 65 kg
  • C. 69 kg
  • D. 67 kg

  • Correct Answer
  • 67 kg 

    Explanation

    Here n1 = 19, a1 = 74, n2 = 38, a1 = 63
    Total average weight = (n1a1 + n2 a2) / (n1 + n2)
    = [(19) (74) + (38) (63)] / (19 + 38)
    = 3800/57 ? 67 kg


  • More questions

    • 1. 
      At simple interest, a sum becomes 3 times in 20 yr. Find the time, in which the sum will be double at the same rate of interest.

    • Options
    • A. 8 yr
    • B. 10 yr
    • C. 12 yr
    • D. 14 yr
    • Discuss
    • 2. 5, 10, 13, 26, 29, 58, 61, (....)

    • Options
    • A. 122
    • B. 64
    • C. 125
    • D. 128
    • Discuss
    • 3. The sum of the present ages of a father and his son is 60 years. Six years ago, father's age was five times the age of the son. After 6 years, son's age will be:

    • Options
    • A. 12 years
    • B. 14 years
    • C. 18 years
    • D. 20 years
    • Discuss
    • 4. A man wants to sell his scooter. There are two offers, one at Rs. 12,000 cash and the other a credit of Rs. 12,880 to be paid after 8 months, money being at 18% per annum. Which is the better offer?

    • Options
    • A. Rs. 12,000 in cash
    • B. s. 12,880 at credit
    • C. Both are equally good
    • Discuss
    • 5. 
      5/12 part of what amount will be equal to 33/4 part of ? 100?

    • Options
    • A. ? 900
    • B. ? 940
    • C. ? 875
    • D. ? 975
    • Discuss
    • 6. 
      Which of the following equations is a quadratic?

    • Options
    • A. x3 - x2 - x + 5 = 0
    • B. x4 - 10
    • C. 7x2 = 49
    • D. x4 - x3 = 9000
    • Discuss
    • 7. A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :

    • Options
    • A.

      1
      4

    • B.

      1
      10

    • C.

      7
      15

    • D.

      8
      15

    • Discuss
    • 8. If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days?

    • Options
    • A. 1
    • B. 72
    • C. 7
    • D. 49
    • Discuss
    • 9. 
      A train passes two persons two persons who are walking in the direction opposite to the direction of train at the rate of 10 m/s and 20 m/s respectively in 12 s and 10 s, respectively. Find the length of the train?

    • Options
    • A. 500 m
    • B. 900 m
    • C. 400 m
    • D. 600 m
    • Discuss
    • 10. A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?

    • Options
    • A. 20 hours
    • B. 25 hours
    • C. 35 hours
    • D. Cannot be determined
    • E. None of these
    • Discuss


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