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    Question

    If (a +b) :(b+ c) :(c+ a) =4:7:9 And a +b+ c =30 then

    find the value of c?
    A 12 Correct Answer Incorrect Answer
    B 15 Correct Answer Incorrect Answer
    C 18 Correct Answer Incorrect Answer
    D 21 Correct Answer Incorrect Answer

    Solution

    a +b =4x           = 4×3=12 b +c =7x           =7×3=21 c +a= 9x           =9×3 =27 so, 2(a +b +c) = 4x+7x+9x=20x a+ b+ c =10x ATQ- 10x = 30 X=3 So now, c= (a +b +c) – (a +b) C = 30-12 =18

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