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  • Question
  • The average age of the boys in a class is 16 years and that of the girls is 15 years. The average age for the whole class is :


  • Options
  • A. 15
  • B. 20
  • C. 21
  • D. data inadequate

  • Correct Answer
  • data inadequate 

    Explanation

     Clearly, to find the average, we ought to know the number of boys, girls or students in the class, neither of which has been given.

    So, the data provided is inadequate.


  • Average problems


    Search Results


    • 1. 16 children are to be divided into two groups A and B of 10 and 6 children. The average percent marks obtained by the children of group A is 75 and the average percent marks of all the 16 children is 76. What is the average percent marks of children of group B?

    • Options
    • A. 233/3
    • B. 243/4
    • C. 254/5
    • D. 345/7
    • Discuss
    • 2. How many window coverings are necessary to span 50 windows, if each window covering is 15 windows long?

    • Options
    • A. 4
    • B. 15
    • C. 3
    • D. 50
    • Discuss
    • 3. The average of marks in 3 subjects is 224. The first subject marks is twice the second and the second subject marks is twice the third. Find the second subject marks ?

    • Options
    • A. 384
    • B. 96
    • C. 192
    • D. 206
    • Discuss
    • 4. Three maths classes: A, B and C take an algebra test. The average score of class A is 83. The average score of class B is 76. The average score of class C is 85. The average score of class A and B is 79 and average score of class B and C is 81. What is the average score of classes A, B, C ?

    • Options
    • A. 81
    • B. 78
    • C. 80.5
    • D. 81.5
    • Discuss
    • 5. It costs Rs. p each to send the first thousand messsages and Rs. q to send each subsequent one . If r is greater than 1,000, how many Rupees will it cost to send r messages ?

    • Options
    • A. 1000 (r - p) + pq
    • B. 1000 p + qr
    • C. 1000 (r - q) + pr
    • D. 1000(p - q) + qr
    • Discuss
    • 6. What is the average of four tenths and five thousandths

    • Options
    • A. 25002
    • B. 2502
    • C. 0.2025
    • D. none
    • Discuss
    • 7. The average of any 5 consecutive odd natural numbers is k . If two more such numbers , just next to the previous 5 numbers are added , the new average becomes

    • Options
    • A. 2(k+1)
    • B. 2k-3
    • C. 2k+1
    • D. k+2
    • Discuss
    • 8. The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then :

    • Options
    • A. x = y + z
    • B. 2x = y + z
    • C. 3x = 2y - 2z
    • D. none of these
    • Discuss
    • 9. In a village the average age of n people is 42 years. But after the verification it was found that the age of a person had been considered 20 years less than the actual age, so the new average, after the correction,increased by 1. The value of n is :

    • Options
    • A. 21
    • B. 20
    • C. 22
    • D. None of these
    • Discuss
    • 10. The average expenditure of the hotel when there are 10 guests is Rs. 60 per guests and the average expenditure is Rs.40 when there are 20 Guests. If it is known that there are some fixed expenses irrespective of the number of guests then the average expenditure per guest whe there are 40 guests in the hotel.

    • Options
    • A. Rs. 30
    • B. Rs. 25
    • C. Rs. 20
    • D. can't be determined
    • Discuss


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