Average


  1. Average monthly income of a family of 4 earning members was Rs. 735. One of the earning members died and therefore, the average income came down to Rs 650. The income of the deceased was?









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    Income of the deceased = Total income of 4 members - total income of remaining 3 members.
    = 735 x 4 - 650 x 3 Rs.

    Correct Option: C

    Income of the deceased = Total income of 4 members - total income of remaining 3 members.
    = 735 x 4 - 650 x 3 Rs.
    = 990 Rs.


  1. The average age of 24 students in a class is 10. If the teacher’s age is included, the average increase by one . The age of the teacher is ?









  1. View Hint View Answer Discuss in Forum

    Age of the teacher = Sum of age of 24 students and teacher - Sum of age of 24 students.
    = 25 x 11 - 24 x 10
    = 35 years.

    Correct Option: C

    Age of the teacher = Sum of age of 24 students and teacher - Sum of age of 24 students.
    = 25 x 11 - 24 x 10
    = 35 years.
    ∴ Age of teacher = 35 years.



  1. The average expenditure of a man for the first five month is Rs. 120 and for the next seven months it is Rs . 130. if he saves Rs 299 in that year, his monthly average income is ?









  1. View Hint View Answer Discuss in Forum

    Total income = total expenditure + total saving
    = Rs. (120 X 5 + 130 X 7 + 290)
    =Rs. 1800

    Correct Option: B

    Total income = total expenditure + total saving
    = Rs. (120 X 5 + 130 X 7 + 290)
    =Rs. 1800

    Average monthly income
    =1800 / 12
    =150 Rs.


  1. The average salary of 20 workers in an office id Rs. 1900 per month . If the manger’s salary is added , the average salary become Rs. 2000 p.m what is the manager’s annual salary ?









  1. View Hint View Answer Discuss in Forum

    Manager's salary per month
    = Rs. (21 x 2000 - 20 x 1900)
    = Rs. 4000

    Correct Option: D

    Manager's salary per month
    = Rs. ( 21 x 2000 - 20 x 1900 )
    = Rs. 4000

    ∴ Manager 's annual salary
    = Rs. (4000 X 12 ) = Rs. 48000.



  1. The average of 6 observation is 12. A new 7th observation is included and the new average is decrease by 1 , the seventh observation is ?









  1. View Hint View Answer Discuss in Forum

    Seventh observation = sum of 7 observations - sum of 6 observations = 7 x 11 – 6 x 12

    Correct Option: C

    Seventh observation = sum of 7 observations - sum of 6 observations = 7 x 11 – 6 x 12
    = 5