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  • Question
  • 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

  • Correct Answer
  • 233/3 

    Explanation

     Required average = [(76 * 16) - (75 * 10)] / 6 = (1216 - 750)/6 = 466/3 = 233 /3.

     


  • Average problems


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    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. What will be the cost of building a fence around a square plot with area equal to 289 sq ft, if the price per foot of building the fence is Rs. 58 ?

    • Options
    • A. Rs. 3748
    • B. Rs. 3847
    • C. Rs. 3944
    • D. Rs. 3154
    • Discuss
    • 6. 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
    • Discuss
    • 7. What is the average of four tenths and five thousandths

    • Options
    • A. 25002
    • B. 2502
    • C. 0.2025
    • D. none
    • Discuss
    • 8. 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
    • 9. 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
    • 10. 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


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