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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.

The average age of a group of 10 students was 20. The average age increased by 2 years when two new students joined the group. What is the average age of the two new students who joined the group?

	A) 22 years
	B) 30 years
	C) 44 years
	D) 32 years
	E) None of these

If the ratio of the sum of the first 6 terms of a G.P. to the sum of the first 3 terms of the G.P. is 9, what is the common ratio of the G.P?

	A) 3
	B) 1/3
	C) 2
	D) 9
	E) 1/9

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

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.

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


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