book Maths Puzzle Numerical Ability

14 = 27 - x

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Charles recieved grades of 82, 93, 77, and 88 on his first four tests. What grade must he get on the fifth test to have an average of 89? please please help me with this problem.ive tried and tried and i still cant get the answer. If the latitude of Chicago is about 42degrees and the radius of the earth is about 4000 miles, how far is Chicago from the equator?(use pi=3.1416)