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math

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The total capacity of 2 water bottles, A and B, is 680 ml. The ratio of bottle A's capacity to bottle B's capacity is 4:6. How much larger is bottle B's capacity than bottle A's?

My answer is 136, am i right?

  • math -

    a + b = 680
    a/b = 2/3
    2 b = 3 a
    a = (2/3) b

    so
    (2/3) b + b = 680
    (5/3 ) b = 680
    b = 408
    then a = (2/3)408 = 272
    then b - a = 136 ml

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