Multiple Choice Questions on If a b 3 5 and b c 7 8 then 2a 3b 7c is equal to ........ for CDS Exam Preparation

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Multiple Choice Questions

If a b 3 5 and b c 7 8 then 2a 3b 7c is equal to ........

Quantitative Aptitude (CDS) Ratio, Proportion
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    If a : b = 3 : 5 and b : c =7 : 8, then 2a : 3b : 7c is equal to

    42 : 105 : 320

    Incorrect Answer

    15 : 21 : 35

    Incorrect Answer

    6 : 15 : 40

    Correct Answer

    30 : 21 : 350

    Incorrect Answer
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    Explanation:
    a:b=3:5⇒a=3x and b=5x
    b:c=7:8⇒b=7y and c=8y
    ∴7y=5x
    ⇒y=5x/7⇒2a:3b:7c
    ⇒2×3x : 3×5x : 7×8×5x/7
    =6 : 15 : 40

    By: Munesh Kumari
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