Search found 12 matches


Re: OG 16: DS 137

There are two ways you can solve this question and you can view any solution and understand it. The most important takeaway for this question is the "common mistakes people make" resulting in getting this question incorrect. Take a moment to view this step-by-step video solution to underst...

by gmatbyexample

Mon Feb 21, 2022 1:44 pm
Forum: Data Sufficiency
Topic: OG 16: DS 137
Replies: 3
Views: 3251

Re: Hypothetical change on OG 2015 #102

Understand the framework to solve these kind of problems and solve the problems with confidence. The full description of the framework & step-by-step solution here: (OG22 Q468) DS04897 | Framework To Solve GMAT Geometry Solid Fit Problems & Step-By-Step solution Basically: 1. Having volume i...

by gmatbyexample

Mon Feb 21, 2022 1:40 pm
Forum: Data Sufficiency
Topic: Hypothetical change on OG 2015 #102
Replies: 4
Views: 3212

Re: OG L-shaped garden

Beauty of this question is not in the reasoning or calculation part, but the three traps it sets up for the people solving. Seldom have I seen so many traps in the same question. Text solution below, however for those interested in detailed step by step solution (video) along with clear call out of ...

by gmatbyexample

Sun Feb 13, 2022 2:02 pm
Forum: Data Sufficiency
Topic: OG L-shaped garden
Replies: 4
Views: 2292

Re: A tank containing water started to leak. Did the tank

here is my approach to this problem in detail. Hopefully this will be helpful. Please do let me know if you feel an alternate approach would be better via a comment on the video. The problem approach can be broken down into four steps: 1. Understanding that the Total Volume at the start = Volume rem...

by gmatbyexample

Tue Sep 07, 2021 3:01 am
Forum: Data Sufficiency
Topic: A tank containing water started to leak. Did the tank
Replies: 2
Views: 816

Re: If x + y + z > 0, is z > 1 ?

Great solution above.

I had prepared a YouTube video for the same in case you are looking for a visual:

https://youtu.be/km49QKnuyoo

by gmatbyexample

Tue Aug 17, 2021 12:10 pm
Forum: Data Sufficiency
Topic: If x + y + z > 0, is z > 1 ?
Replies: 2
Views: 579

Re: A merchant discounted the sale price of a coat and the sale price of a sweater. Which of the two articles of clothin

The important thing to understand in this kind of question is that the values you end up comparing are: C*d & (C+10)(d-2) The former being discount on coat and latter being discount on sweater expressed in terms of coat. If you look at the RHS, (C+10) factor is trying to bring the C*d multiplica...


Re: A grocer stacked oranges in a pile. The bottom layer was rectangular with 3 rows of 5 oranges each. In the second la

A grocer stacked oranges in a pile. The bottom layer was rectangular with 3 rows of 5 oranges each. In the second layer from the bottom, each orange rested on 4 oranges from the bottom layer, and in the third layer, each orange rested on 4 oranges from the second layer. Which of the following is th...


Re: \(q\) is a three-digit number, in which the hundreds digit is greater than the units digit, and the units digit is e

\(q\) is a three-digit number, in which the hundreds digit is greater than the units digit, and the units digit is equal to the tens digit. If \(10^{99}-q\) is divisible by \(9,\) then what is the number of possible values of \(q?\) A. 4 B. 5 C. 6 D. 9 E. 10 Answer: C Source: e-GMAT Good question. ...


Re: DOUBT IN MANHATTAN QUANT QUESTION

If x = (9b - 3ab)/(3/a - a/3), what is x? (1) 9ab/(3+a) = 18/5 (2) b = 1 This question is present in Manhattan guide 2 in chapter Strategy:Combos. It's official answer is A. However I have doubt in that. In the official Manhattan guide explanation the equation is reformed into 3a(3b)(3-a)/(3-a)(3+a...

by gmatbyexample

Mon Jul 12, 2021 12:01 pm
Forum: GMAT Math
Topic: DOUBT IN MANHATTAN QUANT QUESTION
Replies: 1
Views: 8993

Re: If x is a positive integer, what is the remainder when x is divided by 5?

The trick is to understand the units digit of x. We know that multiples of 5 have either 5 or 0 as units digit. So depending on the units digit of x, the remainder w.r.t 5 can be determined. a) x^2 leaves a remainder of 4. First, we need to ask, what could be the units digit of x^2? Case 1: If the c...


Re: In the given figure, BD = 6 and DC = 4. If angle BAD = \(30^o\) and angle ADC = \(120^o,\) find the area of the tria

In these kind of problems, I recommend redrawing the triangle after deriving some preliminary information. Two properties we will use here: 1) Angles on a line are supplementary (their sum is 180) 2) Sum of angles of the triangle is 180 Since Angle ADC is 120 => angle ADB = 60 (sum must be 180). Sin...


Re: Que: If both 7 and \(3^3\) are factors of \(p\cdot4^4\cdot6^2\cdot5^4\) , then what is the smallest.....

The first step would be to prime factorize p*(4^4)*(6^2)*(5^2) = p * 2^8 * (2^2 * 3^2) * 5^2 = p * 2^10 * 3^2 * 5^2 For both 7 and 3^3 to be factors of this number - there should be atleast one 7 (which p could fulfill) and three 3s - we already see that 3^2 is in the factors - which means one addit...