exam Maths Puzzle Numerical Ability

simplify: 1+2/3 / 2+1/2

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I need help to solve this equation

x/2x+2 = -2x/4x+4 + 2x-3/x+1 A store sells regular coffe for $4 a pound and a gourmet coffee for $7 a pound. To get rid of 40 pounds of the gourmet coffee, the shopkeeper plans to make a gourmet blend to sell for $5 a pound. How many pounds of regular coffee should be used?