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# A woman sold 100 oranges at $12.10, some at the rate of 3  Question banks Downloads My Bookmarks Reviews Important topics Author Message TAGS: Director Joined: 07 Jun 2004 Posts: 629 Location: PA Followers: 1 Kudos [?]: 80 [3] , given: 22 A woman sold 100 oranges at$12.10, some at the rate of 3 [#permalink]  26 Jul 2010, 07:39
3
KUDOS
00:00

Difficulty:

45% (medium)

Question Stats:

63% (03:15) correct 36% (02:55) wrong based on 137 sessions
A woman sold 100 oranges at $12.10, some at the rate of 3 for 35 cents and the rest at 7 for 85 cents. How many were sold at the first rate? A. 45 B. 21 C. 9 D. 15 E. 12 [Reveal] Spoiler: OA _________________ If the Q jogged your mind do Kudos me : ) Manager Joined: 02 Apr 2010 Posts: 103 Followers: 3 Kudos [?]: 86 [9] , given: 18 Re: Oranges sold at different rates [#permalink] 26 Jul 2010, 08:58 9 This post received KUDOS This can be solved like a classical mixture problem but numbers are awkward to deal with. It's easier to just look at the answer choices. You know that a multiple of 3 oranges has to be sold at the first rate, and a multiple of 7 at the second rate. You simple subtract the answer choices for the first rate from 100 and check whether the remainder (i.e. the number of oranges sold at the second rate) is a multiple of 7. 100 - 45 = 55 => not a multiple of 7 so exclude 100 - 21 = 79 => not a multiple of 7 so exclude 100 -9 = 91 => a multiple of 7 so keep 100 - 15 = 85 => not a multiple of 7 so exclude 100 - 12 = 88 => not a multiple of 7 so exclude Hence, answer choice 9 is correct. Current Student Status: mba here i come! Joined: 07 Aug 2011 Posts: 270 Location: Pakistan Concentration: Strategy, Marketing Schools: Insead '13 (M) GMAT 1: 680 Q46 V37 GMAT 2: Q V Followers: 22 Kudos [?]: 579 [5] , given: 48 Re: Oranges sold at different rates [#permalink] 29 Feb 2012, 09:03 5 This post received KUDOS \frac{35}{3}x+\frac{85}{7}(100-x)=1210 solve and you'll get x = 9 _________________ press +1 Kudos to appreciate posts Senior Manager Joined: 10 Nov 2010 Posts: 270 Location: India Concentration: Strategy, Operations GMAT 1: 520 Q42 V19 GMAT 2: 540 Q44 V21 WE: Information Technology (Computer Software) Followers: 4 Kudos [?]: 22 [0], given: 22 Re: Oranges sold at different rates [#permalink] 15 Mar 2012, 20:18 \frac{35}{3}x+\frac{85}{7}(100-x)=1210 Can you pls explain the Right hand side of equation. Won't it be 12.10 _________________ The proof of understanding is the ability to explain it. Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 3780 Location: Pune, India Followers: 812 Kudos [?]: 3239 [3] , given: 138 Re: Oranges sold at different rates [#permalink] 15 Mar 2012, 21:45 3 This post received KUDOS Expert's post GMATD11 wrote: \frac{35}{3}x+\frac{85}{7}(100-x)=1210 Can you pls explain the Right hand side of equation. Won't it be 12.10 The equation equates the total selling price. He gets$12.10 i.e. 1210 cents.
If he sold x oranges for 35/3 cents and (100-x) for 85/7 cents, this is a total of
(35/3) * x + (85/7) * (100-x) cents. You equate cents to cents.

Also, you can use the weighted average formula here:

w1/w2 = (85/7 - 121/10)/(121/10 - 35/3) = 9/91

Total 9+91 is 100. So he sells 9 oranges at 35 for 3 and 91 oranges at 85 for 7.
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Save $100 on Veritas Prep GMAT Courses And Admissions Consulting Enroll now. Pay later. Take advantage of Veritas Prep's flexible payment plan options. Veritas Prep Reviews Intern Joined: 12 Aug 2012 Posts: 6 Followers: 0 Kudos [?]: 0 [0], given: 18 Re: Oranges sold at different rates [#permalink] 16 Aug 2012, 23:47 GMATD11 wrote: \frac{35}{3}x+\frac{85}{7}(100-x)=1210 Can you pls explain the Right hand side of equation. Won't it be 12.10 Hi, Because we are taking all the values in cents so we have converted$12.10 into cents which is 1210 cents.
as 1 cent =0.01 Dollar

Hope this helps.

Try and fail but never fail to try.
Director
Joined: 09 Sep 2013
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Re: A woman sold 100 oranges at $12.10, some at the rate of 3 [#permalink] 29 Sep 2013, 07:23 Hello from the GMAT Club BumpBot! 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). Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________ Manager Joined: 23 May 2013 Posts: 60 Followers: 0 Kudos [?]: 11 [0], given: 63 Re: A woman sold 100 oranges at$12.10, some at the rate of 3 [#permalink]  01 Oct 2013, 04:31
for such question need a will power to take on some random complicated numbers. i derived the equation but goofed up with the numbers
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Re: A woman sold 100 oranges at $12.10, some at the rate of 3 [#permalink] 01 Oct 2013, 04:31 Similar topics Replies Last post Similar Topics: A woman will win$3.2 if in 5 tosses of a coin she gets 1 07 Jul 2004, 12:02
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