Three pipes, A, B, & C are attached to a tank. A & B can fill it in 20 & 30 minutes respectively while C can empty it in 15 minutes. If A, B & C are kept open successively for 1 minute each, how soon will the tank be filled?
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x + 4 y relation between x and y is x/2y = 3/2 ie x = 3y find the x -2y ratio
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A MAN'S SALARY IS INCREASED BY 1200 ,TAX IS DECREASED FROM 12% TO 10% BUT HE PAYS SAME AMOUNT AS TAX . WHAT IS THE PREVISIOUS SALARY?