1. Question: If a,b,c,d,e are five consecutive odd numbers ,thier average

    A
    `5(a + 4)`

    B
    `(abcde)/5`

    C
    `5 (a + b + c + d + e)

    D
    None of these

    Note: ckearly ,`b = a + 2,c = a + 4, d = a + 6 and e = a + 8`. :. Average `= (a + (a + 2) + (a + 4) + (a + 6) + (a + 8))/5` `= ((5a + 20)/5)` `= (a + 4)`
    1. Report
  2. Question: The average of `7`consecutive numbers is `33`.The largest of these numbers is :

    A
    `36`

    B
    `32`

    C
    `30`

    D
    `28`

    Note: Let the numbers be `x,x + 2,x + 4 and `x + 6`.Then `(x + x + 2 + x + 4 + x + 6)/4` `= 27⇒ (4x + 12)/4` `= 27 ⇒ x + 3` `= 27⇒ x = 24` :. Largest number `= (24 + 6)` `= 30`
    1. Report
  3. Question: The average height of `30`boys out of a class of `50`,is `160`cm.If the average hieght of the remaining boys is `165`cm, the average height of the whole class (in cm) is :

    A
    `161`

    B
    `162`

    C
    `163`

    D
    `164`

    Note: Required average `= ((30 xx 160 + 20 xx 165)/50)` `= 162 cm`.
    1. Report
  4. Question: The average of three numbers is `20`.If two numbers are `16` and `22`, the third is :

    A
    `22`

    B
    `20`

    C
    `19`

    D
    `18`

    Note: Total sum of three numbers `= (20 xx 3)` `= 60` Third number `= 60 - (16 + 22)` `= 22`
    1. Report
  5. Question: The average of two numbers is M.If one number is N,then the other number is :

    A
    `2 N`

    B
    `2 M`

    C
    `M - N`

    D
    `2 M - N`

    Note: Total sum of two numbers `= 2 M`. :. Other number `= (2 M - N)`.
    1. Report
  6. Question: The average of five result is `46`and that of the first four is `45`.The fifih result is:

    A
    `1`

    B
    `10`

    C
    `12.5`

    D
    `50`

    Note: Fifth result `= (5 xx 46 - 4 xx 45)` `= 50`.
    1. Report
  7. Question: The average of Kanchan,s marks in `7` subjects is `75`.His average in six subject excluding Seciene is `72`.How many marks did he get in Seciene ?

    A
    `72`

    B
    `90`

    C
    `93`

    D
    None of these

    Note: Marks in Seciene `= (7 xx 75 - 6 xx 72)` `= 93`
    1. Report
  8. Question: The average of eight numbers is `14`. The average of six of these numbers is `16`.The average of the remaining two numbers is :

    A
    `4`

    B
    `8`

    C
    `16`

    D
    Date inadequate

    Note: The total sum of remaining two `= (8 xx 14 - 6 xx 16)` `= 16`. :. Average of these two numbers `= 16/2` `= 8`
    1. Report
  9. Question: The average price of these items of furniture is Rs `15000`.If their prices are in the raatio `3:5:7`,the price of the cheapest items is:

    A
    `Rs 9000`

    B
    `Rs 15000`

    C
    `Rs 18000`

    D
    `Rs 21000`

    Note: Let thier prices be `3x,5x`and `7x`. Then,`3x + 5x + 7x` `= (15000 xx 3)` `or x = 3000`. Cost of cheapest item `= 3x = Rs 9000`
    1. Report
  10. Question: Of the three numbers ,second is twice the fist and is also thrice the third .If the average of the three numbers is `44`, the largest number is:

    A
    `24`

    B
    `36`

    C
    `72`

    D
    `108`

    Note: Let `3rd` number be x. Then,second number `= 3x`. ;.First number `= 3x/2`. `:. x + 3x + 3x/2` `= (44 xx 3)` `or (11x)/2` `= 44 xx 3` `or x = 24`. Largest number = 2nd number `= 3x = 72`
    1. Report
Copyright © 2024. Powered by Intellect Software Ltd