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#4-9 If a does not equal to zero, is 1/a > a/(b^4 +3)? (1) a^2=b^2 (2) a^2=b^4 Thanks! Spoiler: The correct answer is A, but I think the answer should be E. Based on statement 1, a and b can have the same numbers but with different signs. Therefore, I think E should be the solution. Is 1/a>a/(b^4+3...

by manpsingh87

Fri Jun 10, 2011 10:10 am
Forum: Data Sufficiency
Topic: MGMAT Problem (Advanced Quant)
Replies: 23
Views: 5746

If a and b are positive integers divisible by 6, is 6 the greatest common divisor of a and b? (1) a = 2b + 6 (2) a = 3b OA is A Official Explanation for this - [spoiler]MGMAT says that for a and b to always have 6 as the GCF, they have to be mutually prime. Hence, Statement 1 is sufficient to answe...

by manpsingh87

Fri Jun 10, 2011 7:07 am
Forum: Data Sufficiency
Topic: Divisibility & Primes - GCF (Tricky)
Replies: 13
Views: 2544

for any +ve int n length of n is defined as no . of prome factors huse prod is = n ex lentght of 75 = 3 since 75 = 3 5 5 how many 2 digits +ve int have lengt = 6 none one two three four [spoiler]ans = two[/spoiler] numbers are 64=2^6; and 96=2^5*3; hence two PS: stop using sms lingo , while posting...

by manpsingh87

Thu Jun 09, 2011 8:50 am
Forum: Problem Solving
Topic: integers
Replies: 3
Views: 998

in xy plane line k pass thru origin and thru (a,b) whr ab not equal = 0 is b +ve slope of line k -ve a< b [spoiler]ans = both[/spoiler] let equation of line be y=mx+c as line passes through origin therefore 0=0+c; hence c=0; therefore equation of line is y=mx; also as line passes through a,b; there...

by manpsingh87

Thu Jun 09, 2011 8:42 am
Forum: Problem Solving
Topic: lines and slopes
Replies: 2
Views: 1034

if n is a +ve int and product of all d int from 1 to n inclusive is a multiple of 990 find least value of n [spoiler]ans = 11[/spoiler] product of all integers from 1 to n=n!; 990=11*3^2*2*5; now largest prime no. in 990 is 11, also since 990, is a factor of n! therefore minimum value of n is 11

by manpsingh87

Thu Jun 09, 2011 7:43 am
Forum: Problem Solving
Topic: multiples
Replies: 4
Views: 1053

75% of the guestrooms at the Stagecoach Inn have a queen-sized bed, and each of the remaining rooms has a king-sized bed. Of the non-smoking rooms, 60% have a queen-sized bed. If 10% of the rooms at the Stagecoach Inn are non-smoking rooms with king-sized beds, what percentage of the rooms permit s...

by manpsingh87

Thu Jun 09, 2011 1:34 am
Forum: Problem Solving
Topic: PROBLEM SOLVING
Replies: 9
Views: 3654

This one is from Kaplan CAT (I find it increasingly that most math questions from Kaplan takes more than 2 minutes to solve!) if x + y^2 = ( x + y^2)^2 , what is the value of y? 1. x=y^2 2. xy^2=0 (only y is squared, not xy) OA c x + y^2 = ( x + y^2)^2----1) 1) x=y^2; put x=y^2 in 1) we have; y^2 +...

by manpsingh87

Wed Jun 08, 2011 8:06 pm
Forum: Data Sufficiency
Topic: A quicker way to solve this problem?
Replies: 7
Views: 1194

Barry plays a game in which he has a jar of marbles, some blue, some pink, some orange, and some yellow, to which he assigns point values of 2, 4, 5, and 7, respectively. After removing some marbles, Barry finds that the product of the point values of the marbles he has removed is 56,000. What coul...

by manpsingh87

Wed Jun 08, 2011 8:37 am
Forum: Problem Solving
Topic: marbles
Replies: 2
Views: 1075

A certain salesman earns a flat payment of $12 per sale on sales up to his daily quota of 10 sales.iF the salesman earns a flat payment of $16 per sale on sale in excess of 10 sales, how many sales did the salesman make today? 1.The salesman earned $48 more for sales made today than for sales made ...

by manpsingh87

Wed Jun 08, 2011 7:51 am
Forum: Data Sufficiency
Topic: Sales
Replies: 6
Views: 2089

A man traveled a distance of 80 km in 7 hrs partly on foot at the rate of 8 km. per hour and partly on bicycle at 16km. per hour. Find the distance traveled on food. A] 36 B]42 C]32 D] 56 E] 28 OA later,,, let p be the no. of hours for which a man traveled on foot and q be the no. of hours for whic...

by manpsingh87

Wed Jun 08, 2011 3:37 am
Forum: Problem Solving
Topic: Difficult Rate sum
Replies: 8
Views: 1899

Q: A boat traveled upstream a distance of 90 miles at an average speed of (V-3) miles per hour and then traveled the same distance downstream at an average of (V+3) miles per hour. If the trip upstream took half an hour longer than the trip downstream, how many hours did it take the boat to travel ...

by manpsingh87

Wed Jun 01, 2011 2:57 am
Forum: Problem Solving
Topic: PS Question
Replies: 3
Views: 1004

X,Y,W and Z are all integers X-Y-Z is even and Y-Z-W is odd. If X is even, what must be true? a)Y-Z must be odd b)W must be even c)W must be odd d)Z must be odd e) Y must be even OA later x-(y+z) is even; also x is even; therefore y+z must be even because Even-Even=Even; y+z will be even if y is ev...

by manpsingh87

Wed Jun 01, 2011 2:09 am
Forum: Data Sufficiency
Topic: ques
Replies: 4
Views: 954

Is triangle ABC a right triangle? 1. < ABC = < BCA 2. <ABC = <CAB + 30 degrees Source: GMAT Club App <ABC=x; <BCA=y; <CAB=z; 1) x=y; also we know that x+y+z=180; 2x+z=180; z=180-2x; when x=45; z=90; and when x=30; z=120; hence 1 alone is not sufficient to answer the question. 2)x=z+30; x+y+z=180; z...

by manpsingh87

Tue May 31, 2011 10:00 am
Forum: Data Sufficiency
Topic: Is Right angle triangle?
Replies: 6
Views: 1578

If X > 3000, then the value of x/(2x + 1) is closest to A> 1/6 B> 1/3 C> 10/21 D> 1/2 E> 3/2 Could someone explain how to choose between C and D ? The best way to handle such questions please. OA is D x/(2x + 1); can be re written as; 1/2(2x/2x+1); 1/2{2x+(1-1)/2x+1}; 1/2{2x+1/2x+1-1/2x+1); 1/2(1-1...

by manpsingh87

Tue May 31, 2011 1:43 am
Forum: Problem Solving
Topic: OG PS Supplement Q# 42
Replies: 6
Views: 1645

If there are 85 students in a statistics class and we assume that there are 365 days in a year, what is the probability that at least two students in the class have the same birthday (assuming birthdays are distributed independently)? Correct Answer: 1 - 365!/[(280!)(365^85)] Can anyone explain sol...

by manpsingh87

Tue May 31, 2011 1:36 am
Forum: Problem Solving
Topic: Birthday Problem
Replies: 2
Views: 3407