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Re: [[x]] is equal to the lesser of the two integer values closest to non-
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23 Aug 2016, 08:25

Bunuel wrote:

[[x]] is equal to the lesser of the two integer values closest to non-integer x. What is the absolute value of \([[-\pi]] + [[-\sqrt{37}]]\) ?

(A) [[9.4]]

(B) [[4 pi]]

(C) \([[\sqrt{99}]]\)

(D) \([[\sqrt{120}]]\)

(E) \([[\sqrt{143}]]\)

Kudos for a correct solution.

"[[x]] is equal to the lesser of the two integer values closest to non-integer x " can be interpreted as floor(x) or round-down of x. i.e if \(x= 3.9, [[x]] = 3\) and if\(x=-3.1, [[x]] = -4\) so \([[-\pi]] + [[-\sqrt{37}]]\) = \([[-3.14] + [[-6.something]]\) = \(-4 + -7\) = \(-11\)

And absolute value is 11. Only E has the value when rounded down equals to 11.

Re: [[x]] is equal to the lesser of the two integer values closest to non-
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26 Aug 2016, 07:13

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Top Contributor

3

Bunuel wrote:

[[x]] is equal to the lesser of the two integer values closest to non-integer x. What is the absolute value of \([[-\pi]] + [[-\sqrt{37}]]\) ?

(A) [[9.4]]

(B) [[4 pi]]

(C) \([[\sqrt{99}]]\)

(D) \([[\sqrt{120}]]\)

(E) \([[\sqrt{143}]]\)

Kudos for a correct solution.

[[−pi]] [[−pi]] = [[−3.14]] = -4, since -4 < -3.14 < -3, and -4 is the lesser of -4 and -3

[[−√37]] Notice that √36 = 6 and √49 = 7, so √37 = 6.something So, [[−√37]] = [[−6.something]] = -7, since -7 < −6.something < -6, and -7 is the lesser of -7 and -6

So, [[−pi]] + [[−√37]] = (-4) + (-7) = -11 This means the ABSOLUTE VALUE of [[−pi]] + [[−√37]] = |-11| = 11

Now check the answer choices....

NOTE: this is one of those questions that require us to check/test each answer choice. In these situations, always check the answer choices from E to A, because the correct answer is typically closer to the bottom than to the top. For more on this strategy, see my article: http://www.gmatprepnow.com/articles/han ... -questions

E) [[√143]] Notice that √121 = 11 and √144 = 12, so √143 = 11.something So, [[√143]] = [[11.something]] = 11 [ since 11 < 11.something < 12, and 11 is the lesser of 11 and 12

Re: [[x]] is equal to the lesser of the two integer values closest to non-
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05 Nov 2018, 01:43

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