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# At least 10 cars have tinting window and fog light. 40% cars which hav

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
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GMAT 1: 800 Q59 V59
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At least 10 cars have tinting window and fog light. 40% cars which hav [#permalink]

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14 Jun 2016, 09:06
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75% (hard)

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53% (02:24) correct 47% (02:22) wrong based on 78 sessions

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At least 10 cars have tinting window and fog light. 40% cars which have tinting windows also have fog light, is the number of the cars with tinting windows larger than that of the cars with the fog light?
1) 80% cars which have fog light also have tinting windows
2) 52 cars have tinting windows or fog light or both

*An answer will be posted in 2 days.
[Reveal] Spoiler: OA

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"Only $79 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 Expert Joined: 02 Aug 2009 Posts: 5776 Re: At least 10 cars have tinting window and fog light. 40% cars which hav [#permalink] ### Show Tags 14 Jun 2016, 09:32 1 This post received KUDOS Expert's post 1 This post was BOOKMARKED MathRevolution wrote: At least 10 cars have tinting window and fog light. 40% cars which have tinting windows also have fog light, is the number of the cars with tinting windows larger than that of the cars with the fog light? 1) 80% cars which have fog light also have tinting windows 2) 52 cars have tinting windows or fog light or both *An answer will be posted in 2 days. ..... cars with tinting window = $$C_t....$$ and cars with fog light =$$C_f....$$ and cars with both = $$C_b....$$ now $$0.4 C_t = C_b...$$ lets see the statements .. 1) 80% cars which have fog light also have tinting windows so $$0.8 C_f = C_b....$$ so $$0.8 C_f = 0.4 C_t.................2C_f = C_t$$ Suff.. 2) 52 cars have tinting windows or fog light or both Just gives total number of cars Insuff A _________________ Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372 Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html GMAT online Tutor Director Status: I don't stop when I'm Tired,I stop when I'm done Joined: 11 May 2014 Posts: 556 Location: Bangladesh Concentration: Finance, Leadership GPA: 2.81 WE: Business Development (Real Estate) At least 10 cars have tinting window and fog light. 40% cars which hav [#permalink] ### Show Tags 14 Jun 2016, 13:03 MathRevolution wrote: At least 10 cars have tinting window and fog light. 40% cars which have tinting windows also have fog light, is the number of the cars with tinting windows larger than that of the cars with the fog light? 1) 80% cars which have fog light also have tinting windows 2) 52 cars have tinting windows or fog light or both *An answer will be posted in 2 days. 1) 40% cars which have tinting windows=80% cars which have fog light=cars have tinting window and fog light, So the number of cars which have tinting windows is definitely larger,Sufficient 2) No particular breakdown about cars have tinting windows or fog light or both,Insuficient Correct Answer A _________________ Md. Abdur Rakib Please Press +1 Kudos,If it helps Sentence Correction-Collection of Ron Purewal's "elliptical construction/analogies" for SC Challenges Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 5269 GMAT 1: 800 Q59 V59 GPA: 3.82 Re: At least 10 cars have tinting window and fog light. 40% cars which hav [#permalink] ### Show Tags 16 Jun 2016, 20:24 If we were to solve this question with our trick, we should observe if one of conditions include ratio. If one of conditions contains ratio, then the condition with ratio has 90% of chance to become the answer. Since the condition 1) has ratio, the correct answer is A. - Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution. _________________ 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$79 for 3 month Online Course"
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Re: At least 10 cars have tinting window and fog light. 40% cars which hav [#permalink]

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22 Dec 2017, 13:16
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Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: At least 10 cars have tinting window and fog light. 40% cars which hav   [#permalink] 22 Dec 2017, 13:16
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# At least 10 cars have tinting window and fog light. 40% cars which hav

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