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A bakery opened yesterday with its daily supply of 40 dozen

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Bunuel
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A bakery opened yesterday with its daily supply of 40 dozen [#permalink] A bakery opened yesterday with its daily supply of 40 dozen   13 Aug 2012, 07:04
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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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Bunuel
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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] A bakery opened yesterday with its daily supply of 40 dozen   13 Aug 2012, 07:04
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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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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] A bakery opened yesterday with its daily supply of 40 dozen   13 Aug 2012, 08:18
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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] A bakery opened yesterday with its daily supply of 40 dozen   23 Jan 2014, 12:03
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] A bakery opened yesterday with its daily supply of 40 dozen   23 Jan 2014, 21:16
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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] A bakery opened yesterday with its daily supply of 40 dozen   24 May 2016, 10:44
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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


The bakery began the day with 40 dozen rolls. Half of the rolls were sold by noon, so we know by noon we had 40 x ½ = 20 dozen rolls sold. It follows that there were 20 dozen rolls remaining between noon and closing time.

We are next given that 80% of the remaining rolls were sold between noon and closing time. Since 80% were sold, 20% were left. This means:

rolls left when the bakery closed = 0.2 x 20 = 4 dozen rolls

Answer: D
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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink] A bakery opened yesterday with its daily supply of 40 dozen   20 Oct 2023, 02:46
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Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink]
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