exam Maths Puzzle Numerical Ability

A simple economy consists of two industries:agriculture and manufacturing. The production of 1 unit of agricultural products requires the consumption of 0.4 unit of agricultural pr

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A tank contains 50 gallons of a 40% solution of antifreeze. How much solution needs to be drained out and replaced with pure antifreeze to obtain a 50% solution? What is the slope-intercept if the line with y intercept 2 and perpendicular to 3x + 2y=6?