exam Maths Puzzle Numerical Ability

Frank got scores of 75, 83, and 79 on his first three tests. What score does he need to make on his next test to have an average of 80?

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exam Other Question

The profit on a small appliance is given by P = x� -3x -60, in which x is the number of appliances sold per day. How many appliances were sold on a day when there was a $20 loss? Do you know the formula in getting the surface area of a hexagon? HOw about the formula in the surface area of a pentagon?