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

Expert's post

1

This post was BOOKMARKED

00:00

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Difficulty:

5% (low)

Question Stats:

93% (01:37) correct
7% (00:34) wrong based on 587 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

Practice Questions Question: 19 Page: 154 Difficulty: 550

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

1

This post received KUDOS

Expert's post

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.

Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink]
17 Aug 2012, 00:07

Expert's post

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.

Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink]
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. _________________

Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink]
23 Jan 2014, 20:16

Expert's post

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. _________________

Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink]
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

Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink]
09 Sep 2014, 22:53

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

Re: A bakery opened yesterday with its daily supply of 40 dozen [#permalink]
11 Jan 2015, 08:27

Yes the "trick" is that they ask for dozen rolls. It is logical to calculaye the 40 dozens in the begining. And since it goes on exlpaining how many of the "rolls" were sold during the day, you sort of forget that it asks about dozens again in the end.

But still, if you do 48/12= 4, you end up with the correct answer.

gmatclubot

Re: A bakery opened yesterday with its daily supply of 40 dozen
[#permalink]
11 Jan 2015, 08:27

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