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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.  Robin earns 30% more than Erica. Charles earns 60% more than Erica. How much % is the wages earned by Charles more than that earned by Robin? A) 23% B) 18.75% C) 30% D) 50% E) 100%    2.  Data Sufficiency : A set S contains the following elements: {7, 11, 15, 19, 23, x}. What is the value of x?  All numbers used are real numbers. (1)    The elements are in arithmetic progression (2)    x is prime This data sufficiency problem consists of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements, plus your knowledge of mathematics and everyday facts (such as the number of days in a leap year or the meaning of the word counterclockwise), you must indicate whether - 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.    3.  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    4.  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    5.  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%

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