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GMAT Prep Quant Missed

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Intern
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GMAT Prep Quant Missed [#permalink]  20 Jan 2007, 12:20
Hi All~~

Attached is a file of quant questions I missed on my first GMAT prep test. Can anyone out there help explain the answers to some of these? THANKS!!!!!

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gmatprep3_quantmissed_jan20.xls [698 KiB]

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Intern
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Why don't you just post them into the body of a message? The danger of downloading files from the internet will likely discourage people from answering.
SVP
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Q12) C

Arc / Perimeter = Angle / Total Angle

Implies,

24 / (D*Pi) = 240 / 360
<=> D*Pi = 36
<=> D = 36/(22/7) = 7*18/11 = 11,45 = 11
SVP
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Q18) E)

I) b @ a
= b + a - b*a
= a + b - a*b
= a @ b

II) a @ 0
= a + 0 - a*0
= a

III)
(a @ b) @ c
= (a + b - a*b) @ c
= (a + b - a*b) + c - (a + b - a*b)*c
= a + b + c - a*b - a*c - b*c + a*b*c (1)

a @ (b @ c)
= a @ (b + c - b*c)
= a + (b + c - b*c) - a*(b + c - b*c)
= a + b + c - b*c - a*b - a*c + a*b*c (2)

Thus (1) & (2) are equivalent
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