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What is the area of the above triangle?

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
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GMAT 1: 760 Q51 V42
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What is the area of the above triangle?  [#permalink]

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06 Sep 2018, 01:33
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15% (low)

Question Stats:

84% (00:39) correct 16% (01:01) wrong based on 38 sessions

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[Math Revolution GMAT math practice question]

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What is the area of the above triangle?

$$1) y=z$$
$$2) y+z=10$$

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MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
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"Only $99 for 3 month Online Course" "Free Resources-30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons - try it yourself"  Math Revolution Discount Codes Magoosh Discount Codes Manhattan GMAT Discount Codes Manager Joined: 18 Jul 2018 Posts: 183 Location: India Concentration: Finance, Marketing WE: Engineering (Energy and Utilities) Re: What is the area of the above triangle? [#permalink] Show Tags 06 Sep 2018, 02:23 From statement 1: The triangle can be an equilateral or isosceles triangle depending on the value of X. Hence Insufficient. From statement 2: No info about the other side X. Hence insufficient. Combining both will not give any new info. Hence E is the answer. GMAT Tutor Status: GMATH founder Joined: 12 Oct 2010 Posts: 167 What is the area of the above triangle? [#permalink] Show Tags 06 Sep 2018, 06:57 MathRevolution wrote: [Math Revolution GMAT math practice question] What is the area of the above triangle? $$1) y=z$$ $$2) y+z=10$$ Let´s go straight to (1+2) . Reason: if we are able to (geometrically) BIFURCATE both statements together immediately, we save a significant amount of time! The areas of both triangles presented are different, and both triangles satisfy both statements. We are done: the answer is (E). This solution follows the notations and rationale taught in the GMATH method. Regards, fskilnik. Attachments 06Set18_13z.gif [ 23.86 KiB | Viewed 253 times ] _________________ Fabio Skilnik :: http://www.GMATH.net (Math for the GMAT) Course release PROMO : finish our test drive till 30/Sep with (at least) 60 correct answers out of 92 (12-questions Mock included) to gain a 70% discount! Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 6204 GMAT 1: 760 Q51 V42 GPA: 3.82 Re: What is the area of the above triangle? [#permalink] Show Tags 09 Sep 2018, 18:22 => Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. Since we have 3 variables (x, y and z) and 0 equations, E is most likely to be the answer. So, we should consider conditions 1) & 2) together first. After comparing the number of variables and the number of equations, we can save time by considering conditions 1) & 2) together first. Conditions 1) & 2) Attachment: 9.10.png [ 13.33 KiB | Viewed 169 times ] If $$x = y = z = 5$$, then the triangle is equilateral, and its area is $$(\frac{√3}{4})*52 = (\frac{25}{4}) √3$$. If $$x = 6$$ and $$y = z = 5$$, then the area of the triangle is $$(\frac{1}{2})6*4 = 12.$$ Since the answer is not unique, conditions 1) & 2) are not sufficient, when taken together. Therefore, E is the answer. Answer: E In cases where 3 or more additional equations are required, such as for original conditions with “3 variables”, or “4 variables and 1 equation”, or “5 variables and 2 equations”, conditions 1) and 2) usually supply only one additional equation. Therefore, there is an 80% chance that E is the answer, a 15% chance that C is the answer, and a 5% chance that the answer is A, B or D. Since E (i.e. conditions 1) & 2) are NOT sufficient, when taken together) is most likely to be the answer, it is generally most efficient to begin by checking the sufficiency of conditions 1) and 2), when taken together. Obviously, there may be occasions on which the answer is A, B, C or D. _________________ MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only$99 for 3 month Online Course"
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Re: What is the area of the above triangle? &nbs [#permalink] 09 Sep 2018, 18:22
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