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Home > Self-Study Quizzes > Quiz GMAT Math practice - (5/36 questions - random) GMAT practice questions.  Once you complete the quiz you will see your score and explanation of the correct answer.  1.  What is the radius of the incircle of the triangle whose sides measure 5, 12 and 13 units? A) 2 units B) 12 units C) 6.5 units D) 6 units E) 7.5 units    2.  If the mean of numbers 28, x, 42, 78 and 104 is 62, then what is the mean of 128, 255, 511, 1023 and x? A) 395 B) 275 C) 355 D) 415 E) 365    3.  If m, s are the average and standard deviation of integers a, b, c, and d, is s > 0? (1)    m > a (2)    a + b + c + d = 0 A) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked. B) Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked. C) BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked. D) EACH statement ALONE is sufficient to answer the question asked. E) Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.    4.  A cube of side 5cm is painted on all its side. If it is sliced into 1 cubic centimer cubes, how many 1 cubic centimeter cubes will have exactly one of their sides painted? A) 9 B) 61 C) 98 D) 54 E) 64    5.  The average of 5 quantities is 6. The average of 3 of them is 8. What is the average of the remaining two numbers? A) 4 B) 5 C) 3 D) 3.5 E) 0.5

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