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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: 7092
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: 7429
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: 2910
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: 4419
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: 4676
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...
- by [email protected]
Mon Apr 19, 2021 8:34 pm- Forum: Problem Solving
- Topic: Which of the following expressions can be written as an inte
- Replies: 3
- Views: 3141
Re: Must be a multiple of what number?
Hi All, This prompt gives us lots of information to work with. We’re told: X and Y are POSITIVE INTEGERS Y is a multiple of 5 3X + 4Y = 200 We’re then asked what X MUST be a multiple of. This question can be solved with a bit of Arithmetic and TESTing VALUES. There’s also a subtle Number Property Ru...
- by [email protected]
Mon Apr 19, 2021 8:31 pm- Forum: Problem Solving
- Topic: Must be a multiple of what number?
- Replies: 7
- Views: 4313
Re: OG Which of the following is greatest
Hi All, We’re asked which of the 5 answer choices is GREATEST. Calculating all of those square roots would be tedious; thankfully, we can modify all 5 answer choices in the same way so that we can AVOID doing those specific calculations. From the wording of the prompt, we know that one of the 5 answ...
- by [email protected]
Mon Apr 19, 2021 8:26 pm- Forum: Problem Solving
- Topic: OG Which of the following is greatest
- Replies: 5
- Views: 2511
Re: Standard deviation table
Hi All, While this question gives us a table full of data, we’re ultimately asked to think about which of the 5 Companies has the highest Standard Deviation in its data – and the GMAT will NEVER actually ask you to calculate S.D. Understanding the basic concepts behind S.D. are necessary though. In ...
- by [email protected]
Mon Apr 19, 2021 8:21 pm- Forum: Problem Solving
- Topic: Standard deviation table
- Replies: 6
- Views: 3670
Re: If p is the perimeter of rectangle Q...
Hi All, The question asks us to figure out the PERIMETER of rectangle Q. For that, we'll need the length (L) and width (W) of the rectangle. 1) Each diagonal of rectangle Q has length 10. From this Fact, we can create one equation: L^2 + W^2 = 10^2 Unfortunately, there are lots of different values f...
- by [email protected]
Sun Apr 18, 2021 3:31 pm- Forum: Data Sufficiency
- Topic: If p is the perimeter of rectangle Q...
- Replies: 2
- Views: 3766
Re: salary of the 10 employees
Hi All, We’re told that the AVERAGE salary of 10 employees last year was $42,800 (meaning that the TOTAL of those salaries was $428,000). We’re asked for the average salary of those same 10 employees this year. This is a great “concept” question – meaning that you do not actually have to do any math...
- by [email protected]
Sun Apr 18, 2021 3:29 pm- Forum: Data Sufficiency
- Topic: salary of the 10 employees
- Replies: 12
- Views: 5397
Re: OG A container in the shape
Hi All, We’re told that a cylindrical tank (re: a cylinder/tube) is HALF full of water and contains 36 cubic inches of water (with the height of the CONTAINER equaling 9 inches). We’re asked for the DIAMETER of the base of the cylinder in inches. Volume of a cylinder is (pi)(Radius^2)(Height), so we...
- by [email protected]
Sun Apr 18, 2021 3:28 pm- Forum: Problem Solving
- Topic: OG A container in the shape
- Replies: 3
- Views: 3753
Re: Can you help with this problem? Thanks!
Hi All, We’re told that S and T are both POSITIVE INTEGERS and that S/T = 64.12; we’re asked which of the 5 answers COULD be the remainder when S is divided by T. The wording of the question implies that there is more than one possible answer, so the first example that we come up with might not be l...
- by [email protected]
Sun Apr 18, 2021 3:24 pm- Forum: Problem Solving
- Topic: Can you help with this problem? Thanks!
- Replies: 5
- Views: 3005
Re: D10 OG 12 Page 21 Geometry
Hi All, To start, it’s incredibly rare to see a Quant question on the GMAT with so many inter-connected shapes (including a hexagon!), so you shouldn’t worry about this question if you got it wrong the first time you attempted it. You can solve it with a mix of Geometry rules and TESTing VALUES. Wit...
- by [email protected]
Sun Apr 18, 2021 3:22 pm- Forum: Problem Solving
- Topic: D10 OG 12 Page 21 Geometry
- Replies: 8
- Views: 6111
Re: OG Closed cylindrical tank Q
Hi All, We’re told that a cylindrical tank (re: a cylinder/tube) contains 36pi cubic feet of water and is filled to HALF of its capacity; when placed upright, the water reaches 4 feet high. We’re asked how high the water reaches when the tank is placed on its side. One of the ‘keys’ to solving this ...
- by [email protected]
Sun Apr 18, 2021 3:21 pm- Forum: Problem Solving
- Topic: OG Closed cylindrical tank Q
- Replies: 3
- Views: 4552