Fractions


  1. If the numerator of a fraction is increased by 200% and the denominator of the fraction is increased by 150%, the resultant fraction is 9/35. What is the original fraction ?











  1. View Hint View Answer Discuss in Forum

    Let the original fraction be p/q.
    Numerator is increased by 200%.
    ∴ Numerator = p + 200% of p
    = p + 200p/100
    = p + 2p
    = 3p
    and denominator of the fraction is increased by 150%.
    Denominator = q + 150q/100

    Correct Option: E

    Let the original fraction be p/q.
    Numerator is increased by 200%.
    ∴ Numerator = p + 200% of p
    = p + 200p/100
    = p + 2p
    = 3p
    and denominator of the fraction is increased by 150%.
    Denominator = q + 150q/100
    = (100q + 150q)/100
    = 250q/100
    = 5q/2
    Then, according to the question,
    3p/5q/2 = 9/35
    3p x 2/5q = 9/35
    6p/5q = 9/35
    ∴ p/q = 9 x 5/35 x 6
    p/q = 3/14


  1. A man reads 3/8 of a book on a day and 4/5 of the remainder on the second day. If the number of pages still unread are 40, then how many pages did the book contain?









  1. View Hint View Answer Discuss in Forum

    Let the number of pages be p.
    Number of pages read on first day = 3p/8
    Remaining pages = p - 3p/8 = (8p - 3p)/8 = 5p/8
    Number of pages read on second day = 4/5 x 5p/8 = p/2
    Now , remaining pages = p - [ 3p/8 + p/2]

    Correct Option: C

    Let the number of pages be p.
    Number of pages read on first day = 3p/8
    Remaining pages = p - 3p/8 = (8p - 3p)/8 = 5p/8
    Number of pages read on second day = 4/5 x 5p/8 = p/2
    Now , remaining pages = p - [ 3p/8 + p/2]
    = p - [(3p + 4p)/8] = [p- 7p/ 8]
    = [(8p - 7p)/ 8] = p/8
    According to the question
    p/8 = 40
    ⇒ p = 40 x 8
    ∴ p = 320



  1. 1/8 part of a pencil is black and 1/2 part of the remaining is white. If the remaining part is blue and length of this blue part is 31/2 cm, then find the length of the pencil.











  1. View Hint View Answer Discuss in Forum

    Let total length of pencil be x cm.
    Then, black part = x/8
    Remaining part pencil after black part = x - x/8 = 7x/8
    then White part = 1/2 (7x/8)
    = 7x/16
    Now Remaining part of pencil is blue = total length of pencil - (length of black part + length of white part)

    put the value and solve the equation.

    Correct Option: C

    Let total length of pencil be x cm.
    Then, black part = x/8
    Remaining part pencil after black part = x - x/8 = 7x/8
    then White part = 1/2 (7x/8)
    = 7x/16
    Now Remaining part of pencil is blue = total length of pencil - (length of black part + length of white part)
    length of blue part of pencil = x - (x/8 + 7x/16)
    length of blue part of pencil = x - (2x + 7x)/16
    length of blue part of pencil = x - 9x/16
    length of blue part of pencil = (16 x - 9x)/16
    ∴ Length of blue part = 7x/16;

    According to question
    Length of blue part = 31/2
    7x/16 = 31/2
    ⇒ 7x/16 = 7/2
    ⇒ x/16 = 1/2
    ⇒ x = 16/2
    ∴ x = 8 cm


  1. In the year 2011, Shantanu gets ₹ 3832.5 as his pocket allowance. Find his pocket allowance per day.











  1. View Hint View Answer Discuss in Forum

    Shantanu's pocket allowance = ₹ 3832.50
    Total days in 2011 (general year) = 365 days

    Correct Option: B

    Shantanu's pocket allowance = ₹ 3832.50
    Total days in 2011 (general year) = 365 days
    Allowance per day = 3832.5/365 = ₹ 10.5



  1. Sum of three fraction is 211/24 . If the greatest fraction is divided by the smallest fraction the result is 7/6, which is greater than the middle fraction by 1/3. Find all the three fractions.











  1. View Hint View Answer Discuss in Forum

    Let the greatest, middle and smallest fraction be P, Q and R respectively in decreasing order.

    According to the question.
    (Greatest fraction) / (Smallest fraction) = 7/6
    ⇒ P/R = 7/6
    ⇒ P = 7R/6 ....(i)
    and Q = 7/6 - 1/3 = 7 - 2/6 = 5/6 (ii)

    Now, P + Q + R = 211/24 (iii )

    Substitute the value of P and Q from Eqs. (i), (ii) and put in Eqs (iii),

    Correct Option: B

    Let the greatest, middle and smallest fraction be P, Q and R respectively in decreasing order.

    According to the question.
    (Greatest fraction) / (Smallest fraction) = 7/6
    ⇒ P/R = 7/6
    ⇒ P = 7R/6 ....(i)
    and Q = 7/6 - 1/3 = 7 - 2/6 = 5/6 (ii)

    Now, P + Q + R = 211/24 (iii )

    Substitute the value of P and Q from Eqs. (i), (ii) and put in Eqs (iii), we get
    ⇒ 7R/6 + 5/6 + R = 59/24
    ⇒ (7R + 5 + 6R)/6 = 59/24
    ⇒ (13R + 5) / 6 = 59/24
    ⇒ 13R = (59/4) - 5 = 39/4
    ⇒ R = 39 / (4 x 13)
    ∴ R = 3/4

    On putting the value of R in Eq. (i), we get
    P = 7R/6 = (7/6) x (3/4) = 7/8