exam Maths Puzzle Numerical Ability

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90-3/2N=30

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Ninety liters of pure maple syrup that costs $8.00 per liter are mixed with imitation maple syrup that costs $2.80 per liter. How much imitation maple syrup is needed to make a mixture to sell for $5.14 per liter? The following picture shows a circular driveway with a flowerbed that lies in the middle. A family is planning to asphalt the driveway and knows the diameter of the whole circle is