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2014-09-30T13:29:24+03:00

V= (4x+3y) / (2x+y)    x/y= 2/7 ⇒ y = 7x/2    V= (4x + 21x/2) / (2x+ 7x/2) = (29x/2) / (11x/2) = 29 / 11