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19 Feb 2014, 07:13
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Difficulty:

45% (medium)

Question Stats:

65% (03:09) correct 35% (01:57) wrong based on 86 sessions

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John Purchased 1375 large bottles at $1.89 per bottle and 690 small bottles at$1.38 per bottle. What was the approximate average price paid per bottle?

A. $1.63 B.$1.64
C. $1.68 D.$1.72
E. $1.76 Can anyone please suggest a short and simple method for solving this question if possible. [Reveal] Spoiler: OA Last edited by Bunuel on 19 Feb 2014, 07:53, edited 1 time in total. Renamed the topic and edited the question. Senior Manager Status: busyness school student Joined: 09 Sep 2013 Posts: 419 Location: United States Schools: Tepper '16 (M) GMAT 1: 730 Q52 V37 Followers: 15 Kudos [?]: 298 [8] , given: 145 Re: John Purchased 1375 large bottles at$1.89 [#permalink]

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19 Feb 2014, 07:31
8
KUDOS
First, see that 690 is approximately half of 1375.

So in total, we have two parts large bottles, and one part small bottle.

Now we can just add 1.89 + 1.89 + 1.38 and divide by 3 to get our answer.
If you do this calculation, we get exactly 1.72.

However, I would just add 1.9 + 1.9 + 1.4 = 5.2, and now divide by 3 to get 5.2/3 = 1.73
Because we rounded up (1.89 to 1.9 and 1.38 to 1.4) the answer is actually a bit less than 1.73, so the closest answer is 1.72, D.
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19 Feb 2014, 09:10
farful wrote:
First, see that 690 is approximately half of 1375.

So in total, we have two parts large bottles, and one part small bottle.

Now we can just add 1.89 + 1.89 + 1.38 and divide by 3 to get our answer.
If you do this calculation, we get exactly 1.72.

However, I would just add 1.9 + 1.9 + 1.4 = 5.2, and now divide by 3 to get 5.2/3 = 1.73
Because we rounded up (1.89 to 1.9 and 1.38 to 1.4) the answer is actually a bit less than 1.73, so the closest answer is 1.72, D.

Thanks I realized that 690 is approximately half of 1375 but still ended up making a mistake.. Realized it through your explanation..
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Re: John Purchased 1375 large bottles at $1.89 per bottle and 69 [#permalink] Show Tags 21 Jul 2015, 09:46 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. _________________ Re: John Purchased 1375 large bottles at$1.89 per bottle and 69   [#permalink] 21 Jul 2015, 09:46
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