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A bakery opened yesterday with its daily supply of 40 dozen

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A bakery opened yesterday with its daily supply of 40 dozen [#permalink] New post 13 Aug 2012, 06:04
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94% (01:34) correct 6% (00:29) wrong based on 280 sessions
A bakery opened yesterday with its daily supply of 40 dozen rolls. Half of the rolls were sold by noon, and 80 percent of the remaining rolls were sold between noon and closing time. How many dozen rolls had not been sold when the bakery closed yesterday?

(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

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Page: 154
Difficulty: 550
[Reveal] Spoiler: OA

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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] New post 13 Aug 2012, 06:04
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SOLUTION

A bakery opened yesterday with its daily supply of 40 dozen rolls. Half of the rolls were sold by noon, and 80 percent of the remaining rolls were sold between noon and closing time. How many dozen rolls had not been sold when the bakery closed yesterday?

(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

20 rolls were sold sold by noon and 80% of the remaining 20 rolls were sold between noon and closing time, thus only 20% of these remaining 20 rolls had not been sold when the bakery closed. Hence 0.2*20=4 rolls had not been sold when the bakery closed.

Answer: D.
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COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] New post 13 Aug 2012, 07:18
answer is D ...4 dozens ....

half sold by noon --> 20 dozens (20 *12 =240)
remaining --> 20 dozens i.e 240 eggs...
80% sold --> 80*240/100 =192 eggs
remaining 20 % --> 48 eggs (4 dozens ) --> answer
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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] New post 13 Aug 2012, 08:21
I'm also getting D, but the OA is E. Looking forward to the explanation.
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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] New post 13 Aug 2012, 08:26
Answer has to be 4 dozens, May be the OA is wrong :)
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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] New post 13 Aug 2012, 09:00
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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] New post 17 Aug 2012, 00:07
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SOLUTION

A bakery opened yesterday with its daily supply of 40 dozen rolls. Half of the rolls were sold by noon, and 80 percent of the remaining rolls were sold between noon and closing time. How many dozen rolls had not been sold when the bakery closed yesterday?

(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

20 rolls were sold sold by noon and 80% of the remaining 20 rolls were sold between noon and closing time, thus only 20% of these remaining 20 rolls had not been sold when the bakery closed. Hence 0.2*20=4 rolls had not been sold when the bakery closed.

Answer: D.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] New post 02 Aug 2013, 11:56
worst question ever i thought the bakery would make rolls during the day. what kind of bakery doesn't bake their own rolls?
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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] New post 23 Jan 2014, 11:03
isn't 40 dozen rolls mean 40x12? If i go this bakery and say give me half a dozen rolls, they will charge me for 6 rolls. not 0.5 rolls. So the total rolls should be 40X12. half rolls sold by noon mean remaining is 20x12. 80% by closing means, 0.2x20x12 remaining = 48.

whats the trick here to choose value as 40 as a starting value for total rolls.

BTW, i choose D by ignoring "dozen" in the problem by just looking at the answer choices.
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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] New post 23 Jan 2014, 20:16
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pradeepss wrote:
isn't 40 dozen rolls mean 40x12? If i go this bakery and say give me half a dozen rolls, they will charge me for 6 rolls. not 0.5 rolls. So the total rolls should be 40X12. half rolls sold by noon mean remaining is 20x12. 80% by closing means, 0.2x20x12 remaining = 48.

whats the trick here to choose value as 40 as a starting value for total rolls.

BTW, i choose D by ignoring "dozen" in the problem by just looking at the answer choices.


Read the question again: "How many dozen rolls had not been sold when the bakery closed yesterday?"

They want the answer in dozen rolls. You get the answer as 4 dozen rolls.
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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] New post 23 Jan 2014, 21:50
Bunuel wrote:
A bakery opened yesterday with its daily supply of 40 dozen rolls. Half of the rolls were sold by noon, and 80 percent of the remaining rolls were sold between noon and closing time. How many dozen rolls had not been sold when the bakery closed yesterday?

(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

Practice Questions
Question: 19
Page: 154
Difficulty: 550


40/2 * 20/100 = 4

Option D
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Re: A bakery opened yesterday with its daily supply of 40 dozen   [#permalink] 23 Jan 2014, 21:50
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