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    If A:B:C = 2:3:5, then the ratio of AB:BC:CA\frac{A}{B}:\frac{B}{C}:\frac{C}{A}BA​:CB​:AC​​ is equal to:
    Question

    If A:B:C = 2:3:5, then the ratio of AB:BC:CA\frac{A}{B}:\frac{B}{C}:\frac{C}{A}​ is equal to:

    A.

    20:18:75

    B.

    75:20:29

    C.

    18:20:79

    D.

    20:25:39

    Correct option is A

    Given:

    A:B:C = 2:3:5

    Formula Used:

    Ratio and Proportions

    Solution:

    Let the numbers A,B and C be 2x,3x and 5x respectively

    Then AB=2x3x=23\frac{A}{B} = \frac{2x}{3x} = \frac{2}{3}​​

    BC=3x5x=35 \frac{B}{C} = \frac{3x}{5x} = \frac{3}{5}​​

    CA=5x2x=52 \frac{C}{A} = \frac{5x}{2x} = \frac{5}{2}​​

    AB:BC:CA=23:35:52 \frac{A}{B}:\frac{B}{C}:\frac{C}{A}=\frac{2}{3}:\frac{3}{5}:\frac{5}{2}​​

    Taking LCM of 3,5 and 2 = 30

    23×30:35×30:52×30\frac{2}{3}\times 30:\frac{3}{5}\times 30:\frac{5}{2}\times 30​​

    =20:18:75= 20:18:75​​

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