Ratio, Proportion


  1. In a class, the number of boys is more than the numbers of girls by 12% of the total strength. The ratio of boys to girls is ?









  1. View Hint View Answer Discuss in Forum

    Let the number of boys and girls be x and y respectively. Then
    From question, (x - y ) = 12% of (x + y)

    Correct Option: B

    Let the number of boys and girls be x and y respectively. Then
    From question, (x - y ) = 12% of (x + y)
    ⇒ x/y = 3/25 (x + y )
    ⇒ 25x - 25y = 3x + 3y
    ⇒ 22x = 28y
    ∴ x / y = 28 / 22 = 14 / 11


  1. Three friends divided Rs. 624 among themselves in the ratio 1/2 : 1/3 :1/4. The share of the third friend is ?









  1. View Hint View Answer Discuss in Forum

    Ratio = 1/2 : 1/3 : 1/4 = 6 : 4 : 3
    ∴ share of third friend = Rs. (624 x 3/13)
    = Rs. 144

    Correct Option: D

    Ratio = 1/2 : 1/3 : 1/4 = 6 : 4 : 3
    ∴ share of third friend = Rs. (624 x 3/13)
    = Rs. 144



  1. The ratio of two number is 3 : 4 and thier sum is 420. the greater of the two numbers is ?









  1. View Hint View Answer Discuss in Forum

    Greater number = 420 x (4/7) = 240

    Correct Option: C

    Greater number = 420 x (4/7) = 240


  1. If carton containing a dozen mirrors is dropped, which of the following cannot be the ratio of broken mirrors to unbroken mirrors ?









  1. View Hint View Answer Discuss in Forum

    For dividing 12 into two whole numbers, the sum of the terms of the ratio must be a factor of 12.

    Correct Option: C

    For dividing 12 into two whole numbers, the sum of the terms of the ratio must be a factor of 12. so, they cannot be in the ratio 3 :2.



  1. Two whole numbers whose sum is 64, cannot be in the ratio ?









  1. View Hint View Answer Discuss in Forum

    For dividing 64 into two whole number, the sum of the terms of the ratio must be factor of 64.

    Correct Option: C

    For dividing 64 into two whole number, the sum of the terms of the ratio must be factor of 64, so they cannot be in the ratio 3 : 4.