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INET Average Test 199
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INET Average Test 199

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  • Question 1/5
    1 / -0
    The average weight of 22 children is 35 kg. If the weight of the teacher is also included, the average weight becomes 37 kg. What is the weight of the teacher?
    Solutions
    The average weight of 22 children is 35 kg.

    Sum of weight of 22 children = kg

    If the weight of the teacher is also included, the average weight becomes 37 kg.

    Sum of weight of 22 children and teacher = kg

    Weight of teacher = 851 – 770 = 81 kg

  • Question 2/5
    1 / -0
    Two classes X and Y have average marks 50 and 70 respectively, the overall average obtained is 55. If total students of class X and class Y are 456 then find number of students in class Y ?
    Solutions
    Two classes X and Y have average marks 50 and 70 respectively.

    Let number of students in class X = x

    Number of students in class Y = y

    According to question

    ⇒

    ⇒

    ⇒

    ⇒

    Now, Total students of class X and class Y are 456

    ⇒ 4 unit = 456

    ⇒ 1 unit = 114

    Number of students in class Y = 114

  • Question 3/5
    1 / -0
    Out of 20 persons, 6 are each of 1 m 20 cm , 8 are of 1 m 15 cm and rest of 1 m 10 cm. The average height of all of them is :
    Solutions

    According to the questions

    Out of 20 persons, 6 are each of 1 m 20 cm , 8 are of 1 m 15 cm and rest of 1 m 10 cm.

    Sum of heights of 6 persons =

    Sum of heights of 8 persons =

    Sum of heights of 6 persons =

    Average height of all of them =

  • Question 4/5
    1 / -0
    Average age of a group of 25 boys is 40 years. Two boys with ages 25 years and 35 years left the group. One boy with age 55 years joined the group. What is the new average age (in years) of the group?
    Solutions

    It is given that average age of a group of 25 boys is 40 years.

    Sum of ages of boys =

    Two boys with ages 25 years and 35 years left the group and one boy with age 55 years joined the group.

    Hence, Total number of students = 25 – 2 + 1 = 24

    Sum of ages of 24 boys = 1000 – 25 – 35 + 55 = 995

    New average age of the group =

  • Question 5/5
    1 / -0
    Two classes A and B have average marks 45 and 55 respectively, the overall average obtained is 52. The ratio of the students in the class A and B is:
    Solutions

    Two classes A and B have average marks 45 and 55 respectively.

    Let number of students in class A = x

    Number of students in class B = y

    According to question

    ⇒

    ⇒

    ⇒

    ⇒

    Hence, Required ratio = 3 : 7

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