Ratio, Proportion


  1. If 1/5 : 1/N = 1/N : 1/1.25, then the value of N is ?









  1. View Hint View Answer Discuss in Forum

    Given 1/5 : 1/N = 1/N : 1/1.25
    ⇒ 1/5 x 1/1.25 = 1/N x 1/N
    ⇒ N2 = 5 x 1.25 = 6.25
    ∴ N = 2.5

    Correct Option: C

    Given 1/5 : 1/N = 1/N : 1/1.25
    ⇒ 1/5 x 1/1.25 = 1/N x 1/N
    ⇒ N2 = 5 x 1.25 = 6.25
    ∴ N = 2.5


  1. If one-third of A, one-fourth of B and one-fifth of C are equal, then A : B : C is ?









  1. View Hint View Answer Discuss in Forum

    ∵ 1/3 A = 1/4, B = 1/5, C = x
    Then, A = 3x, B = 4x and C = 5x

    Correct Option: A

    ∵ 1/3 A = 1/4, B = 1/5, C = x
    Then, A = 3x, B = 4x and C = 5x
    ∴ A : B : C = 3x : 4x : 5x = 3 : 4 : 5



  1. The ratio which (1/3 of Rs. 9.30) bears to (0.6 of Rs. 1.55) is ?









  1. View Hint View Answer Discuss in Forum

    Req. ratio = (1/3 of Rs. 9.30) / (0.6 of Rs. 1.55)
    = 3.10 / 0.93

    Correct Option: B

    Req. ratio = (1/3 of Rs. 9.30) / (0.6 of Rs. 1.55)
    = 3.10 / 0.93
    = 310 / 93
    = 10 / 3


  1. If a : b = 2 : 3 and 2 : a =1 : 2, then the value of 'b' is ?









  1. View Hint View Answer Discuss in Forum

    ∵ a / b = 2/3 and 2 / a = 1/2
    ⇒ a/b x 2/a = 2/3 x 1/2

    Correct Option: B

    ∵ a / b = 2/3 and 2 / a = 1/2
    ⇒ a/b x 2/a = 2/3 x 1/2
    ⇒ 2/b = 1/3
    ∴ b = 6



  1. If 2A = 3B and 4B = 5C, then A : C is ?









  1. View Hint View Answer Discuss in Forum

    ∵ 2A = 3B and 4B = 5C
    ⇒ 8A = 12B and 12B = 15C
    ⇒ 8A = 12B = 15C = x
    ∴ A = x/8, B = x/12, C = x/15

    Correct Option: C

    ∵ 2A = 3B and 4B = 5C
    ⇒ 8A = 12B and 12B = 15C
    ⇒ 8A = 12B = 15C = x
    ∴ A = x/8, B = x/12, C = x/15
    So, A : C = x/8 : x/15 = 15 : 8