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Re: Help on Geometry Problem - OG 13 - PS#75

Hi All, We’re given an EQUILATERAL triangle – with the three points of the triangle equidistant from the ‘center’ point P. We’re asked to rotate the triangle CLOCKWISE and we are asked how many degrees it would take for Point B (re: the top of the triangle) to get to where Point A is (the lower-left...

by [email protected]

Wed Apr 21, 2021 8:09 pm
Forum: Problem Solving
Topic: Help on Geometry Problem - OG 13 - PS#75
Replies: 8
Views: 4149

Re: For a party, three solid cheese (OG2016)

Hi All, We’re told that 3 solid cheese ball spheres with DIAMETERS of 2 inches, 4 inches and 6 inches are going to be combined into one larger sphere. We’re asked for the approximate DIAMETER of that sphere in inches. While a sphere is a really rare shape on the GMAT (you likely won’t have to deal w...

by [email protected]

Wed Apr 21, 2021 8:08 pm
Forum: Problem Solving
Topic: For a party, three solid cheese (OG2016)
Replies: 4
Views: 2893

Re: rate problem

Hi All, This prompt starts by telling us that three printing presses (R, S and T) can complete a job TOGETHER in 4 hours. This first sentence implies that we’re dealing with a “Work Formula” question – and there are a couple of different ways to go about solving these types of prompts. We’re then to...

by [email protected]

Wed Apr 21, 2021 8:07 pm
Forum: Problem Solving
Topic: rate problem
Replies: 5
Views: 4111

Re: Q.65 Problem Solving GMAT Review 13th Edition

Hi All, Here, we’re told that the distance between the Sun and a planet is 2.3 x 10^14 INCHES. We’re asked which answer is closest to that distance in KILOMETERS. This is just a ‘unit conversion’ question (and the prompt tells us that 1 km = 3.9 x 10^4 inches), so we just have to keep track of the d...

by [email protected]

Wed Apr 21, 2021 8:07 pm
Forum: Problem Solving
Topic: Q.65 Problem Solving GMAT Review 13th Edition
Replies: 6
Views: 4051

Re: #60 Official Guide

Hi All, This question is really wordy – and gives us a lot of information to keep track of - but it gives us that information in a logical order, so we just have to be diligent about taking notes and we can get everyone on our note-pad in one read-through. We’re told: 1) On the 1st day, Orangeade is...

by [email protected]

Wed Apr 21, 2021 8:06 pm
Forum: Problem Solving
Topic: #60 Official Guide
Replies: 5
Views: 4390

Re: In the figure shown, the triangle

Hi All, In this prompt, we are told that a triangle is INSCRIBED in a semi-circle (which means that all 3 points of the triangle are ON the circumference of the half-circle) – and we are given the lengths of the two shorter sides of the triangle (6 and 8). We’re asked for the ARC LENGTH of the semi-...

by [email protected]

Wed Apr 21, 2021 8:05 pm
Forum: Problem Solving
Topic: In the figure shown, the triangle
Replies: 3
Views: 3588

Re: If a( a + 2) = 24

Hi All, This prompt gives us two equations to work with: A(A+2) = 24 B(B+2) = 24 And we’re told that A is NOT equal to B. We’re asked for the sum of A+B. At first glance, the two equations appear to be identical (meaning that A would equal B). However, since we’re told that those two values are NOT ...

by [email protected]

Tue Apr 20, 2021 8:35 pm
Forum: Problem Solving
Topic: If a( a + 2) = 24
Replies: 2
Views: 1330

Re: OG 16 Question 67

Hi All, We’re told that K is an integer and that (.0025)(.025)(.00025)(10^K) is an INTEGER. We’re asked for the least possible value of K. Since we’re given a lot of numbers to work with, this is essentially just an Arithmetic question – but you might find the work much faster to deal with depending...

by [email protected]

Tue Apr 20, 2021 8:35 pm
Forum: Problem Solving
Topic: OG 16 Question 67
Replies: 9
Views: 4046

Re: If x/y = c/d and

Hi All, While this Roman Numeral question looks a bit complicated, it just involves comparing fractions, so we can use basic Arithmetic rules to answer it (and you can solve it Algebraically or by TESTing VALUES.) To start, you should notice that C/D and D/C appear in the two equations – meaning tha...

by [email protected]

Tue Apr 20, 2021 8:34 pm
Forum: Problem Solving
Topic: If x/y = c/d and
Replies: 3
Views: 1921

Re: OG 2018 problem solving #89

Hi All, We’re told that a 10 total ounces of water is evaporated at a rate of 0.01 ounces of water each day for 20 days. We’re asked what PERCENT of the water EVAPORATED during those 20 days. You should notice that the 5 answers all involve percentages AND decimals (so this is a ‘decimal shift’ ques...

by [email protected]

Tue Apr 20, 2021 8:33 pm
Forum: Problem Solving
Topic: OG 2018 problem solving #89
Replies: 5
Views: 6467

Re: Closest to 1/2?

Hi All, We’re asked which of the following fractions is CLOSEST to ½. There are a number of different ways to approach the Arithmetic in this question (and you can use the given fractional answers or convert them to decimals). Since the numerator of each answer is MORE than half of the denominator, ...

by [email protected]

Tue Apr 20, 2021 8:33 pm
Forum: Problem Solving
Topic: Closest to 1/2?
Replies: 8
Views: 5771

Re: OG Shawana made a schedule

Hi All, We’re told that Shawana is going to read for 28 days with the following restrictions: -She will read 50 pages a day from 1 book (or fewer, if doing so would complete that book) -She will never read from more than 1 book a day. We’re asked how many total books she will read in the 28-day time...

by [email protected]

Tue Apr 20, 2021 8:32 pm
Forum: Problem Solving
Topic: OG Shawana made a schedule
Replies: 4
Views: 1863

Re: In the xy coordinate plane, which of the following

Hi All, With this prompt, we’re asked which of the following points will ALWAYS lie on the line (K)(X) + 3(Y) = 6 for EVERY possible value of K. This is a great ‘concept question’, meaning that you don’t have to do a lot of math to answer it if you recognize the concept involved (and that concept is...

by [email protected]

Mon Apr 19, 2021 8:40 pm
Forum: Problem Solving
Topic: In the xy coordinate plane, which of the following
Replies: 4
Views: 3402

Re: Four staff members

Hi All, We’re told that four staff members spent time working on a project in the ratio of 2:3:5:6 and that ONE of the staff members worked 30 hours. We’re asked which of the following could NOT be the total number of hours worked by the four members. Since this question involves ratios, it’s worth ...

by [email protected]

Mon Apr 19, 2021 8:36 pm
Forum: Problem Solving
Topic: Four staff members
Replies: 5
Views: 3932

Re: Which of the following expressions can be written as an inte

Hi All, We’re asked which of the following Roman Numerals can be written as an INTEGER. While Roman Numeral questions can sometimes be time-consuming, this one is relatively straight-forward and is built on a couple of Number Property rules that can help you to avoid doing heavy calculations. You al...