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Please try to post the problems in written words so that people can later search for it. And this problem has been discussed a number of times in the forum. Try to use the search feature of the forum. Here is one solution I posted not a month ago >> http://www.beatthegmat.com/geometry-question-t2177...

by Anju@Gurome

Mon Apr 29, 2013 10:36 pm
Forum: Problem Solving
Topic: 153-Quantitative Review
Replies: 1
Views: 1123

If j > 1, is integer j a prime number? (1) When j is divided by 3, the remainder is 1. (2) When j is divided by 2, the remainder is 1. One simple thing about prime number is they are rarely predictable and there is no formula to generate a prime number. A prime number may be represented in a partic...

by Anju@Gurome

Mon Apr 29, 2013 10:26 pm
Forum: Problem Solving
Topic: If j > 1, is integer j a prime number? (1) When j is div
Replies: 4
Views: 2538

Joan took out a mortgage from her local bank. Each monthly mortgage payment she makes must be triple the amount of the previous month's payment. If her first payment is $100, and the total amount she must pay back is $328,000, how many months will it take Joan to pay back her mortgage? This is a ge...

by Anju@Gurome

Mon Apr 29, 2013 10:19 pm
Forum: Problem Solving
Topic: Joan took out a mortgage from her local bank. Each monthly
Replies: 1
Views: 1215

vipulgoyal wrote:experts please suggest

whats wrong with this

1/20 * 1/19 * 1 * 1 * 1 * 5(factorial) = 6/19
Unless you post your reasoning behind multiplying those numbers (and why you selected those numbers in the first place), it is difficult to point out your mistake.

by Anju@Gurome

Mon Apr 29, 2013 10:01 pm
Forum: Problem Solving
Topic: Probability
Replies: 9
Views: 3250

On planet Simplon, each year has 12 months, each of which consists of exactly 30 days. If Simplon experiences a political scandal every 2/3 of a year, an environmental crisis every 1/6 of a year, and a terrible movie opening every 1/36 of a year, then what is the ratio of the number of political sc...

by Anju@Gurome

Mon Apr 29, 2013 9:49 pm
Forum: Problem Solving
Topic: On planet Simplon, each year has 12 months, each of which
Replies: 2
Views: 1350

We have a separate section for DS problems please post your next DS problems there. Given that c<d, e<c, is c>8? 1. c + d + e = 24 2. d < 12 We know that e < c < d. We need to determine c > 8 or not. For this type of problem, always try to pick some numbers on both sides of the asking limit (here 8)...

by Anju@Gurome

Mon Apr 29, 2013 9:36 pm
Forum: Problem Solving
Topic: number system
Replies: 2
Views: 3417

In the problem solving section. The first question involves a pentagon PQRST, PQ = 3, QR = 2, RS = 4, ST = 5, which of the following lengths 5, 10, and 15 could be the value of PT? The length of any side of a polygon with n sides should be smaller than the sum of other (n - 1) sides. This is nothin...

by Anju@Gurome

Mon Apr 29, 2013 9:13 pm
Forum: Problem Solving
Topic: Quantitative Review
Replies: 1
Views: 1119

if d = 1^2 = 1 then √1 is not an integer Take a break. I think you are over-stressing. :) √1 = 1 is an integer. If d is a positive integer, is √d an integer 1. d is a square of an integer 2. √d is the square of an integer Statement 1: If d is a square of an integer, square root of d must be...

by Anju@Gurome

Mon Apr 29, 2013 11:32 am
Forum: Data Sufficiency
Topic: Can someone please clarify this
Replies: 3
Views: 1069

length of diagonal of rectangle = hypotenuse of a 30-60-90 triangle The triangle can very well be 45-45-90 triangle or 20-70-90 triangle or 40-50-90 triangle. In each case the lengths of the sides will be different and the address of the rectangular region will be different too. what is the area of...

by Anju@Gurome

Mon Apr 29, 2013 11:18 am
Forum: Data Sufficiency
Topic: DS Geometry questions
Replies: 4
Views: 1201

x is divisible by 144. If ³√x is an integer, then which of the following is ³√x definitely divisible by? As ³√x is an integer, x must be a cube of an integer. Let us assume, x = 144k = (12²)*k, where k is some positive integer. We can see that minimum possible value of k such that (12²)*...

by Anju@Gurome

Mon Apr 29, 2013 10:42 am
Forum: Problem Solving
Topic: Divisibility
Replies: 1
Views: 1336

I think it'll be easier for you if I can point out your mistake. 400 = ST = (S + 20)(T-1) = ST-S+20T-20 -->-S+20T -20 =0 Insufficient The part in blue is actually two equations : ST = 400 and (S + 20)(T - 1) = 400 By writing ST = (S + 20)(T - 1), you are discarding half of the information. So, what ...

by Anju@Gurome

Mon Apr 29, 2013 8:36 am
Forum: Data Sufficiency
Topic: Distance
Replies: 6
Views: 1589

1. x > 3^12 - 3^4 x > 3^4 (3^8 - 1) x > 3^4 * (3^4 + 1) * (3^4 - 1) x > 3^4 * (3^4 + 1) * (3^2 + 1) * (3^2 - 1) x > 3^4 * ~3^4 * ~3^2 * ~3^2 x > ~3^12 Although you've got the correct answer, I just want to add that those three lines marked in green are unnecessary time waste. When you can approxima...

by Anju@Gurome

Mon Apr 29, 2013 6:57 am
Forum: Data Sufficiency
Topic: Is x > 3^10 ?
Replies: 7
Views: 1749

# nos to select from = 20 Total # ways to select 5 out of 20 nos = 20C5 prob that both 5 and 15 is selected (among 5 selected numbers) = 2 (either 5,15 or 15,5) Ways to select other 3 numbers = 18C3 Reqd prob = (2 * 18C3) / 20C5? First of all it is not probability but number of ways to select both ...

by Anju@Gurome

Mon Apr 29, 2013 5:37 am
Forum: Problem Solving
Topic: Probability
Replies: 9
Views: 3250

A certain mixture of nuts consists of 4 parts almonds to 1 part walnuts, by weight. By removing some of the almonds, the remained nuts consist 75 percent of almonds, by weight. What percent of the almonds were removed? Let us assume initially there was 100 gm of nuts. So, there was 100*4/(4 + 1) = ...

by Anju@Gurome

Mon Apr 29, 2013 5:19 am
Forum: Problem Solving
Topic: Averages
Replies: 4
Views: 1722

If 5 numbers are to be selected from integers from 1 to 20, inclusive, without replacement, what is the probability that both 5 and 15 will be selected? Total number of ways to select 5 integers from 20 integers = 20 C 5 As 2 integers (5 and 15) are always selected, to satisfy the given criteria we...

by Anju@Gurome

Mon Apr 29, 2013 5:12 am
Forum: Problem Solving
Topic: Probability
Replies: 9
Views: 3250