Ratio, Proportion


  1. Total number of students in a class is 95. if the total number of girls in the class is 45, then the ratio of total number if boys to total number girls is









  1. View Hint View Answer Discuss in Forum

    Let the total number of boys in the class be x.
    Then, according to the question,
    x + 45 = 95
    x = 95 - 45 = 50

    Correct Option: C

    Let the total number of boys in the class be x.
    Then, according to the question,
    x + 45 = 95
    x = 95 - 45 = 50

    Hence, the required ratio of total number of boys to total number of girls = B:G = 50:45 = 10:9


  1. The ratio of money with Ram and Gopal is 7 : 17 and that with Gopal and Krishan is 7: 17. If Ram has Rs. 490, Krishan has ?









  1. View Hint View Answer Discuss in Forum

    Ram : Gopal = 7 : 17 = 49 : 119
    Gopal : Krishan = 7 : 17 = 119 : 289
    ∴ Ram : Gopal : Krishan = 49 : 119 : 289

    Correct Option: A

    Ram : Gopal = 7 : 17 = 49 : 119
    Gopal : Krishan = 7 : 17 = 119 : 289
    ∴ Ram : Gopal : Krishan = 49 : 119 : 289
    ⇒ Ram : Krishan = 49 : 289
    Thus, 49 : 289 = 490 : N
    &there N = 289 x 490 / 49
    = Rs. 2890



  1. The prices of a scooter and a television set are in the ratio 3 : 2. If a scooter costs Rs. 6000 more than the television set, the price of the television set is ?









  1. View Hint View Answer Discuss in Forum

    Let the price of a scooter be Rs. 3x and that of a television set Rs. 2x.
    Then, 3x - 2x = 6000

    Correct Option: C

    Let the price of a scooter be Rs. 3x and that of a television set Rs. 2x.
    Then, 3x - 2x = 6000
    ⇒ x = 6000

    ∴ Cost of a television set = 2x
    = Rs. 12000


  1. If 8 : y = y : 18 , then y is equal to ?









  1. View Hint View Answer Discuss in Forum

    ∵ 18 x 18 = y2
    ∴ y = √144 = 12

    Correct Option: D

    ∵ 18 x 18 = y2
    ∴ y = √144 = 12



  1. A circle and a square have same area. Therefore, the ratio of the side of the square and the radius of the circle is ?









  1. View Hint View Answer Discuss in Forum

    Let the side of the square be 'a' and let the radius of the circle be 'r'
    Then, a2 = πr2
    ⇒ a2 / r2 = π
    ⇒ a / r = √π

    Correct Option: A

    Let the side of the square be 'a' and let the radius of the circle be 'r'
    Then, a2 = πr2
    ⇒ a2 / r2 = π
    ⇒ a / r = √π
    ∴ a : r = √π : 1