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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.  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    2.  If the price of gasoline increases by 25% and Ron intends to spend only 15% more on gasoline, by what % should he reduce the quantity of petrol that he buys? A)  10% B)  12.5% C)  8% D)  12% E)  6.66%    3.  The sum of the fourth and twelfth term of an arithmetic progression is 20. What is the sum of the first 15 terms of the arithmetic progression? A) 300 B) 120 C) 150 D) 170 E) 270    4.  How many diagonals does a 63-sided convex polygon have? A) 3780 B) 1890 C) 3843 D) 3906 E) 1953    5.  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

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