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Re: PS1000 Sec5 #19

One-fifth of the light switches produced by a certain factory are defective. Four-fifths of the defective switches are rejected and 1/20 of the nondefective switches are rejected by mistake. If all the switches not rejected are sold, what percent of the switches sold by the factory are defective? (...

by marcusking

Mon Apr 06, 2009 5:51 am
Forum: Problem Solving
Topic: PS1000 Sec5 #19
Replies: 2
Views: 715

Excellent write up. I really enjoyed the quotes from great military minds too :D .

Congrats on the great score and good luck at the application process. BTW thanks, I got a few helpful tips out of this...

by marcusking

Wed Apr 01, 2009 5:49 am
Forum: I just Beat The GMAT!
Topic: Waging War on the GMAT (760 - 99th percentile)
Replies: 55
Views: 123437

Re: greatest integer function

The greatest integer function for a given number is equal to the integer it has last exceeded, for a number x, its greatest integer function is denoted by [x]. If │x + 2│ = x + 2; and [x] = 3, and x is an integral multiple of 0.9. Find x. We know from │x + 2│ = x + 2 that x ...

by marcusking

Wed Apr 01, 2009 5:33 am
Forum: Problem Solving
Topic: greatest integer function
Replies: 2
Views: 1320

Re: cubic meter

The mass of 1 cubic meter of a substance is 800 kilograms under certain conditions. What is the volume, in cubic centimeters of 1 gram of this substance under these condition (1 kilogram= 1000 grams and 1 cubic meter = 1,000,000 cubic centimeters. a. .80 b. 1.25 c. 8.00 d. 12.50 e. 80.00 how do i s...

by marcusking

Wed Apr 01, 2009 5:27 am
Forum: Problem Solving
Topic: cubic meter
Replies: 2
Views: 4269

Area = 1/2(bh) = 12 .5(4)h=12 h=6 so the absolute value of the y-intercept is 6. We can't know it is positive or negative unless we know more about line k. Since we know it has a positive x-intercept and is positively sloped, its y-intercept is negative. A I also arrived @ the answer the same way. ...

by marcusking

Wed Apr 01, 2009 5:19 am
Forum: Problem Solving
Topic: xy plane
Replies: 8
Views: 5740

Re: 10! and 10! + 20 inclusive

sanju09 wrote:How many integers divisible by 3 are there between 10! and 10! + 20 inclusive?

A. 6
B. 7
C. 8
D. 9
E. 10


OA B
Since 10! includes a multiplication of 3 10! must be divisible by 3 so that's one. No 20/3 = 6.

6+1 = 7.

B.

by marcusking

Wed Apr 01, 2009 5:17 am
Forum: Problem Solving
Topic: 10! and 10! + 20 inclusive
Replies: 11
Views: 1337

I. Product of two distinct primes. The product of 2 and 5 can be divisible by 10. OUT. II. An integer less than 10. 0 is divisible by 10. OUT III. Sum of three consecutive integers. 9+10+11 is divisible by 10. OUT IV. An odd integer. An odd integer is never divisible by 10. IN Choose E. Am I right?...

by marcusking

Wed Apr 01, 2009 5:11 am
Forum: Problem Solving
Topic: CANNOT yield an integer
Replies: 4
Views: 3189

let number of interns be 100 if 80 get < 6 hrs sleep, 20 get > 6 hrs of sleep. 70% of interns, who receive > 6 hrs of sleep have no fatigue => 70%*20=14 have > 6 hrs of sleep and no fatigue given 75% of interns or 75 get < 6 hrs of sleep and have fatigue. =>80-75=5 get < 6 hrs of sleep and have no ...

by marcusking

Wed Apr 01, 2009 5:05 am
Forum: Problem Solving
Topic: feelings of fatigue
Replies: 12
Views: 1363

Here is the next one.... Is x=y? I. (x+y)(1/x + 1/y) = 4 II. (x-30)^2 = (y-30)^2 I'll go with D. Either 1). when we factor this out we get x + (x/y) + (y/x) + y = 4 so we have the sum of 4 numbers that must equal 4. I could only get this statement to work if both x & y = 1 so 1 + 1 + 1 + 1 = 4. I i...

by marcusking

Mon Mar 23, 2009 9:26 am
Forum: Data Sufficiency
Topic: Data Sufficiency for 780+ Aspirants
Replies: 38
Views: 11621

Re: OG11, DS #144

This fact applies for both the statements The answer cannot be D since N is positive. N can only be 0 or 1 as a result statement 2 is insuff I ll go for A If N=0 then it is not a positive integer. If N = 1 then N doesn't satisfy the 2nd equation as (1/10)^0 = 1 which is not less than 0.1 For the 2n...

by marcusking

Wed Mar 18, 2009 4:58 am
Forum: Data Sufficiency
Topic: OG11, DS #144
Replies: 6
Views: 1082

Great solution Morgoth! Is this question type likely to appear on the GMAT though? The standard deviation questions I've seen are far simpler than this one. This one requires that you know about normal distribution which I haven't seen in any of the study materials and really haven't seen since my b...

by marcusking

Wed Mar 18, 2009 4:41 am
Forum: Data Sufficiency
Topic: Rocktown College
Replies: 7
Views: 6588

Re: Modulus DS Prob

What is the value of |x+7|? 1. |x+3| = 14 2. (x+2)^2 = 169 Well the ans is D . But can anyone please explain what is wrong with C I agree it should be C. 1. x could be either 11 or -17 INSUFFICIENT 2. x could be either 11 or -15 INSUFFICIENT Combine both together so that x = 11 and you have your an...

by marcusking

Wed Mar 18, 2009 4:36 am
Forum: Data Sufficiency
Topic: Modulus DS Prob
Replies: 4
Views: 734

Re: for DS questions - square root

Lets say the question says... whats the value of x? 1. sq root(x) = x-2 solving we get x=4 and x=1 However x=1 doesnt satisfy the above equation...and the ans is x=4...so can we say Statement 1 is sufficient? Thanks Keep in mind also that if x was 4 you could also end up -2 = 4-2 or -2 = 2. Almost ...

by marcusking

Wed Mar 18, 2009 4:32 am
Forum: Data Sufficiency
Topic: for DS questions - square root
Replies: 2
Views: 719

I am unable to understand the difficulty in this question. :? :D I agree. But, the reason I posted this question is because I selected B as my answer, but the answer provided in Princeton book is D. There is no explanation provided. So, I thought I will discuss in this forum to check if I am missin...

by marcusking

Tue Mar 17, 2009 5:58 am
Forum: Data Sufficiency
Topic: Brand X
Replies: 6
Views: 1065

Wow that's a great starter score! Especially the verbal portion! With a little bit of practice you can go a long way. Have you checked the resources section of this site? http://www.beatthegmat.com/resources.html There are plenty of links that should get you started on your quantitative review. Pers...

by marcusking

Wed Mar 11, 2009 1:15 pm
Forum: GMAT Strategy
Topic: 690 practice w/out study, question about practice test
Replies: 2
Views: 775