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Aptitude miscellaneous
  1. The average marks of a class of 35 children is 35. The marks of one of the students, who got 35, was incorrectly entered as 65. What is the correct average of the class?








  1. View Hint View Answer Discuss in Forum

    According to question ,
    Total correct marks of 35 children = 35 × 35 + 35 – 65 = 1225 – 30 = 1195

    Required average =
    1195
    		 = 34.14
    35

    Second method to find the required average ,
    Diffference = – 65 + 35 = – 30

    Correct Option: B

    According to question ,
    Total correct marks of 35 children = 35 × 35 + 35 – 65 = 1225 – 30 = 1195

    Required average =
    1195
    		 = 34.14
    35

    Second method to find the required average ,
    Diffference = – 65 + 35 = – 30
    Required average = 35 –
    30
    35

    Required average = 35 – 0.857 = 34.143

  1. The average weight of 15 oarsmen in a boat is increased by 1.6 kg when one of the crew, who weighs 42 kg is replaced by a new man. Find the weight of the new man (in kg).








  1. View Hint View Answer Discuss in Forum

    Here, N = 15, T = 42, t = 1.6
    We can find required answer with the help of given formula ,
    Weight of new oarsman = ( N + T × t )
    Weight of new oarsman = (42 + 15 × 1.6) kg.

    Correct Option: C

    Here, N = 15, T = 42, t = 1.6
    We can find required answer with the help of given formula ,
    Weight of new oarsman = ( N + T × t )
    Weight of new oarsman = (42 + 15 × 1.6) kg.
    ∴ Weight of new oarsman = (42 + 24) kg. = 66 kg.

  1. The average of all the numbers between 6 and 50 which are divisible by 5 is








  1. View Hint View Answer Discuss in Forum

    Given , Numbers are : 10, 15, 20, 25, 30, 35, 40, 45
    Sum of given numbers = 220

    Average =
    Sum of given numbers
    Total numbers

    Correct Option: A

    Given , Numbers are : 10, 15, 20, 25, 30, 35, 40, 45
    Sum of given numbers = 220

    Average =
    Sum of given numbers
    Total numbers

    Average =
    220
    8

    Average = 27.5

  1. The average of 8 numbers is 27. If each of the numbers is multiplied by 8, find the average of new set of numbers.








  1. View Hint View Answer Discuss in Forum

    Given , The average of 8 numbers = 27
    If each item is multiplied by 8, their average gets multiplied by 8.
    ∴ Required average = 8 × The average of 8 numbers

    Correct Option: D

    Given , The average of 8 numbers = 27
    If each item is multiplied by 8, their average gets multiplied by 8.
    ∴ Required average = 8 × The average of 8 numbers
    Required average = 8 × 27 = 216

  1. The average monthly salary of all the employees in an industry is ₹ 12,000. The average salary of male employees is ₹ 15,000 and that of female employees is ₹ 8,000. What is the ratio of male employees to female employees ?








  1. View Hint View Answer Discuss in Forum

    Let Male employees = p
    Female employees = q
    ∴ (p + q) 12000 = p × 15000 + q × 8000
    ⇒ (p + q) × 12 = 15p + 8q
    ⇒ 12p + 12q = 15p + 8q
    ⇒ 3p = 4q

    Correct Option: C

    Let Male employees = p
    Female employees = q
    ∴ (p + q) 12000 = p × 15000 + q × 8000
    ⇒ (p + q) × 12 = 15p + 8q
    ⇒ 12p + 12q = 15p + 8q
    ⇒ 3p = 4q

    ⇒
    p
    		 =
    4
    q3

    ⇒ p : q = 4 : 3