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GMAT Prep Questions
Question: Was just curious as to why QDS00268 is E vs. C. Given that statement 1 says “the x intercept of line k equals 0”, which by definition means that x = 0 when y = 0, it would seem that the coordinates in terms of (x1,y1) would equal (0,0). And given that statement 2 says “the y intercept of line k equals 0”, which by definition means that y = 0 when x = 0, it would that the coordinates in terms of (x2,y2) would equals (0,0). Together, wouldn't the two statements result in a slope that equals 0? Using the (y2-y1)/(x2-x1) slope formula, wouldn't the answer be (0-0)/(0-0) = 0?
GMAC's response: To calculate slope, you must have two different sets of coordinates. Because both statements yield the same coordinates, the answer cannot be determined.
Question: I have query regarding GMATPrep Question Pack 1 - Quantitative Question QDS00268. In the xy-plane is the slope of line k equal to 0? (1) The x-intercept of k is 0. (2) The y-intercept of k is 0. The official answer is (E), however I think the answer must be (A), please clarify this for me.
GMAC's response: There are an infinite number of equations that have an x-intercept = 0, but do not have a slope equal to 0. The answer explanation provides just one counter example: the equation y=x. Other counter examples include y=2x, y=3x, y=1/2x, y=1/3x, etc. Because there is at least one example where the answer is yes (the slope = 0) and at least one example where the answer is no (the slope is not = 0), statement (1) is not sufficient.
Question: The solution for practice test question from the free GMATPrep software QDS14002 is in error. The correct answer is "Statements (1) and (2) TOGETHER are NOT sufficient." You are not accounting for the situation where X = 0. If the question read "Is X greater than OR equal to zero, then your published response would be correct.
GMAC’s response: This challenge is invalid due to ‘greater than’ and ‘less than’ signs ( > and < ). Because the statements each exclude the possibility of ‘equal to’ zero, than each statement alone is sufficient.
GMAT Review Questions
Question: I found a mistake in the 12th edition GMAT review book. On page 112 statement number (6) says ”if x is positive and y is negative, then xy is negative.” That contradicts what is said on page 108 paragraph 4, ”if at least one factor of a product of integers is even, then the product is even.”
GMAC's response: There aren't any contradictions in the two statements. Here is an example: 2 x -3 = -6. The number 2 is even and so is -6. The number -3 is negative and so is -6.
Question: I believe #72 in Data Sufficiency in the 13th Edition is a trick question. When I first answered the question I answered choice (D). I clearly thought (A) was sufficient and here's why. When I read statement (1) I read it as "The product of M/2 is an odd integer". It seems like they are reading it as "The product of M/2 is not only not even but also not an integer." If you interpret it you would say that Statement (1) is sufficient because the only way to get an odd integer each time is to divide 2 by 6, 10, 14, etc. This pattern is always even so the answer is "no" every time, thus being sufficient.
GMAC’s response: “M/2 is NOT an even integer” is not the same as “M/2 is an odd integer.” The question was worded intentionally to insure careful consideration of all of the possible meanings. If the wording of a question seems odd, think of all the possible reasons why it would be worded that way and not another.
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