Search found 199 matches
What is the least possible value that can be subtracted from 2^586 so that the result is a multiple of 7? A. 2 B. 3 C. 5 D. 7 E. 11 What is the best way to solve? any shortcut?? Hmmm, I attacked this as follows. First, notice (D) is obviously wrong. If you subtract 7 from a number and the resulting...
- by 800_or_bust
Thu Jul 07, 2016 10:30 am- Forum: Problem Solving
- Topic: Expert needed
- Replies: 7
- Views: 2611
For other shapes, we may be able to use pieces of the strategy. For example, if one side of a triangle were parallel to the x-axis, then the two vertices on that side of the triangle would share the same y-coordinate. Here's an example: http://www.beatthegmat.com/og-13-coordinate-geometry-t157190.h...
- by 800_or_bust
Thu Jul 07, 2016 7:08 am- Forum: Problem Solving
- Topic: wonderful P & C ques :
- Replies: 15
- Views: 9081
If 0<x<y, is x<4? 1) (1/x)+(1/y)=1/2 2) 1/x>1/4 *An answer will be posted in 2 days (1) SUFFICIENT. x must be between 2 and 4, in order for this equation to be true and the given inequality to hold. If x were greater than or equal to 4, then we would be adding a number equal to or less than 50% of ...
- by 800_or_bust
Thu Jul 07, 2016 6:22 am- Forum: Data Sufficiency
- Topic: If 0<x<y, is x<4?
- Replies: 2
- Views: 1245
If x, y are positive integers, what is the unit digit of 2^(4x+2)+y? 1) x=1 2) y=2 *An answer will be posted in 2 days (1) NOT SUFFICIENT. If x = 1, then the expression simplifies to 2^6 + y = 64 + y. The units digit of the expression depends on the value of y, which we do not know. If y = 0, then ...
- by 800_or_bust
Thu Jul 07, 2016 6:17 am- Forum: Data Sufficiency
- Topic: If x, y are positive integers, what is the unit digit of 2^(
- Replies: 2
- Views: 1937
Q. If k is a positive integer, is k a multiple of 40? K is a multiple of 4 K is a multiple of 10 (1) NOT SUFFICIENT. K could be 4, which is obviously not a multiple of 40, or K could be 40, which is a multiple of 40. (2) NOT SUFFICIENT. K could be 10, which is not a multiple of 40. Or K could be 40...
- by 800_or_bust
Thu Jul 07, 2016 6:08 am- Forum: Data Sufficiency
- Topic: Data sufficiency
- Replies: 5
- Views: 1707
Choice (E) is a trainwreck. Pun intended. More seriously, the meaning is ambiguous as some of the others pointed out.girishj wrote:Why is B correct and E wrong?
- by 800_or_bust
Wed Jul 06, 2016 5:59 am- Forum: Sentence Correction
- Topic: SC - GMAT Prep
- Replies: 8
- Views: 4835
Hi happy888. Sometimes the word "company" is used as an adjective, as it is in that sentence. So I guess the sentence is ok. Yes, such as in company car. Kind of informal though & would really disadvantage non-native speakers, so I sort of doubt it would appear on the GMAT as a correc...
- by 800_or_bust
Wed Jul 06, 2016 5:57 am- Forum: Sentence Correction
- Topic: Verbal - Sentence Correction
- Replies: 3
- Views: 1422
Is x+y>0? 1) x>|y| 2) y<0 *An answer will be posted in 2 days (1) This statement tells us two things - x is positive & x has a greater absolute value than y. Thus, even if y is negative, the sum of x and y will be positive. Consider some examples: x = 3, y = -2; x = 6, y = -5, etc... Thus, this...
- by 800_or_bust
Wed Jul 06, 2016 5:43 am- Forum: Data Sufficiency
- Topic: Is x+y>0?
- Replies: 2
- Views: 1083
Which of the following is closest to (10!-9!)/(10!+9!)? A. 0.01 B. 0.1 C. 0.2 D. 1 E. 10 *An answer will be posted in 2 days (10!-9!)/(10!+9!) ((9!)(10-1))/((9!)(10+1)) (10-1)/(10+1) 9/11 Closest approximation among the answer choices is 1 . Answer choice: D
- by 800_or_bust
Wed Jul 06, 2016 5:36 am- Forum: Problem Solving
- Topic: Which of the following is closest to (10!-9!)/(10!+9!)?
- Replies: 4
- Views: 1586
Pretty challenging. I correctly got (C) but just by logical reasoning. Since the base of the equilateral triangle has side 6, and that's a chord of the circle, the radius must be greater than 3. The largest chord is the diameter and the base of the triangle would not be a diameter (the diameter woul...
- by 800_or_bust
Tue Jul 05, 2016 1:22 pm- Forum: Problem Solving
- Topic: equilateral triangle pS
- Replies: 61
- Views: 34546
Seed mixture x is 40 percent ryegrass and 60 percent bluegrass by weight, seed mixture y is 25 percent ryegrass and 75 percent fescue. If a mixture of x and y contains 30 percent ryegrass. WHat percent of the weight of the mixture is x? a. 10 % b.33.3% c.40% d.50% e.66.67% qa is b although the answ...
- by 800_or_bust
Tue Jul 05, 2016 11:11 am- Forum: Problem Solving
- Topic: seed mixture
- Replies: 19
- Views: 14027
Is it true that when the number of terms in a set is even, then it can’t be concluded that 50% of terms are greater/less than or equal to the median? But then, the I found the following statement in an official answer: The average of a set of consecutive integers is also the middle of the set, wi...
- by 800_or_bust
Tue Jul 05, 2016 6:25 am- Forum: Problem Solving
- Topic: Median of an even set
- Replies: 6
- Views: 2140
Which of the following is closest to (10^19-10^3)/(10^17+1)? A. 0.01 B. 0.1 C. 0.2 D. 1 E. 10 *An answer will be posted in 2 days Factor out 10^3 from the numerator. So we have: (10^3(10^16 - 1))/(10^17+1) Since we are approximating the -1 and +1 are negligible (10^16 and 10^17 are humongous number...
- by 800_or_bust
Tue Jul 05, 2016 6:19 am- Forum: Problem Solving
- Topic: Which of the following is closest to (10^19-10^3)/(10^17+1)?
- Replies: 3
- Views: 1171
If x, y are positive integers, what is the remainder when 2^(8x+y) is divided by 5? 1) x=1 2) y=2 *An answer will be posted in 2 days To start, I decided to look for a pattern when dividing powers of 2 by 5. Notice: 2^0/1 has a remainder of 1, 2^1/5 has a remainder of 2, 2^2/5 has a remainder of 4,...
- by 800_or_bust
Tue Jul 05, 2016 6:10 am- Forum: Data Sufficiency
- Topic: If x, y are positive integers, what is the remainder when 2^
- Replies: 2
- Views: 1203
Hello, Can you please assist with the following question from MGMAT: The next number in a certain sequence is defined by multiplying the previous term by some positive constant k, where k ≠1. How many of the first nine terms in this sequence are greater than 1? (1) The ninth term in this sequenc...
- by 800_or_bust
Tue Jul 05, 2016 5:49 am- Forum: Data Sufficiency
- Topic: How many of the first nine terms are greater than 1?
- Replies: 9
- Views: 3554