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2014-04-26T17:40:14+03:00

a+b=3(a-b)

a+b+3(a-b)=320⇒a+b+3a-3b=320⇒4a-2b=320⇒2(2a-b)=320⇒2a-b=160⇒a=(160+b)/2

160+b+2b=3(160+b-2b)⇒160+3b=480-3b⇒6b=320⇒b=320/6

a=(160+b)/2⇒a=[160+(320/6)]/2=640/6

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