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Register now and save up to $200 Available with Beat the GMAT members only code • Free Trial & Practice Exam BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • Get 300+ Practice Questions 25 Video lessons and 6 Webinars for FREE Available with Beat the GMAT members only code • Magoosh Study with Magoosh GMAT prep Available with Beat the GMAT members only code • 5 Day FREE Trial Study Smarter, Not Harder Available with Beat the GMAT members only code • Free Practice Test & Review How would you score if you took the GMAT Available with Beat the GMAT members only code • 1 Hour Free BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code ## How many D tagged by: This topic has 4 member replies ### GMAT/MBA Expert sanju09 GMAT Instructor Joined 21 Jan 2009 Posted: 3650 messages Followed by: 81 members Thanked: 267 times GMAT Score: 760 #### How many D Thu Apr 09, 2009 3:57 am Elapsed Time: 00:00 • Lap #[LAPCOUNT] ([LAPTIME]) L spends total$6.00 for one kind of D and one kind of C. How many D did he buy?

(1) The price of 2 D was $0.10 less than the price of 3 C. (2) The average price of 1 D and 1 C was$0.35.

OA E

_________________
The mind is everything. What you think you become. –Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

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kanha81 Master | Next Rank: 500 Posts
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Thu Apr 09, 2009 8:05 am
The first time I solved this problem, I got it wrong. Here's how I would attempt to solve.

Let n: number of D's sold
m: number of C's sold
d: price of 1 D
c: price of 1 C

First try:
Given, d + c = 6
i) 2d = 3c - 0.10

Here I thought it's solvable because I have 2 equations 2 variables. hence A or D

ii) Avg. price = (d+c) / 2 = 0.35
=> d + c = 0.70

Cannot solve because we have 2 equations with same quantities of D and
C.

Therefore, [A]

Second try:
Given, d + c = 6

i) 2d = 3c - 0.10
No information on total number of C's or D's sold. Only information about the price give. Hence B, C, or E

ii) d + c = 0.70
No new information besides what's given. Hence C or E

i) & ii) No information on total number of C's or D's. Nothing new. Hence [E]

Take-aways: Just by seeing 2 variables and 2 equation don't think that you can find what is asked for in the question. Understand the question FIRST.

Thanks.

_________________
Want to Beat GMAT.
Always do what you're afraid to do. Whoooop GMAT

vittalgmat Legendary Member
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Thu Apr 09, 2009 9:24 am
Hi Sanju,
This looks like the Donut and cupcake problem?

Look at the discussion here
http://www.beatthegmat.com/lew-s-doughnut-prank-t34411.html

Thanks though for for your effort to create a new problem.

### GMAT/MBA Expert

sanju09 GMAT Instructor
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Fri Apr 10, 2009 3:36 am
vittalgmat wrote:
Hi Sanju,
This looks like the Donut and cupcake problem?

Look at the discussion here
http://www.beatthegmat.com/lew-s-doughnut-prank-t34411.html

Thanks though for for your effort to create a new problem.
Not all questions that I post here are my own creations; you can take this question for instance. The plain and simple identity of my own questions is that it won't include the OA along with the post, otherwise is not always true. I pick and post only those questions here that I personally feel must be attempted by its mass for one reason or the other.

What I shall be doing from next time and onwards, I shall be writing MBM meaning Made By Me beneath all questions that are coming straight from my own kitchen; right vittalgmat!

_________________
The mind is everything. What you think you become. –Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

Free GMAT Practice Test How can you improve your test score if you don't know your baseline score? Take a free online practice exam. Get started on achieving your dream score today! Sign up now.
vittalgmat Legendary Member
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Fri Apr 10, 2009 9:17 am
No worries my friend!!!.
I truly appreciate your attempt to create problems. Though D and C were easy to figure out.. I may not figure out others.. Such simple changes can put our thinking hats out of whack. So my request is: Keep it coming!!!.

I think MBM is a good idea, so that ppl who attempt these problems will know what they are signing up for .

All in good jest
-V

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