(0.2x15) : (0.8x7.5) ::_________:(0.25x56)

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  1. (0.2x15) : (0.8x7.5) ::_________:(0.25x56), I assume your :: means "=" ?

    (0.2x15) / (0.8x7.5) = X/(0.25x56)

    X = (0.25x56)(0.2x15) / (0.8x7.5)
    X = 7

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  2. (0.0625x112)

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