It is currently 18 Nov 2017, 12:45

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# There were 36.000 hardback copies of a certain novel sold

Author Message
Director
Joined: 13 Mar 2007
Posts: 542

Kudos [?]: 91 [0], given: 0

Schools: MIT Sloan
There were 36.000 hardback copies of a certain novel sold [#permalink]

### Show Tags

02 May 2007, 21:57
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

There were 36.000 hardback copies of a certain novel sold before the paperback version was issued. From the time the first paperback copy was sold until the last copy of the novel was sold. 9 times as many paperback copies as hardback copies were sold. If a total of 441.000 copies of the novel were sold in all, how many paperback copies were sold?

(A) 45.000
(B) 360.000
(C) 364.500
(D) 392.000
(E) 396.900

If y ≠ 3 and (3x/y) is a prime integer greater than 2, which of the following must be true?
Ⅰ. x = y
Ⅱ. y = 1
Ⅲ. x and y are prime integers.

(A) None
(B) Ⅰ only
(C) Ⅱonly
(D) Ⅲonly
(E) Ⅰand Ⅲ

Kudos [?]: 91 [0], given: 0

Senior Manager
Joined: 19 Feb 2007
Posts: 325

Kudos [?]: 68 [0], given: 0

Re: 1000 series - dont agree with the OA ! [#permalink]

### Show Tags

02 May 2007, 22:23
Quote:
There were 36.000 hardback copies of a certain novel sold before the paperback version was issued. From the time the first paperback copy was sold until the last copy of the novel was sold. 9 times as many paperback copies as hardback copies were sold. If a total of 441.000 copies of the novel were sold in all, how many paperback copies were sold?

(A) 45.000
(B) 360.000
(C) 364.500
(D) 392.000
(E) 396.900

Total copies sold = 36000 + 9x + x = 441000

=> x = 40500

So no of Paperback copies = 9x = 364500

Ans C

Quote:
If y ≠ 3 and (3x/y) is a prime integer greater than 2, which of the following must be true?
Ⅰ. x = y
Ⅱ. y = 1
Ⅲ. x and y are prime integers.

(A) None
(B) Ⅰ only
(C) Ⅱonly
(D) Ⅲonly
(E) Ⅰand Ⅲ

Ans B

Kudos [?]: 68 [0], given: 0

Director
Joined: 13 Mar 2007
Posts: 542

Kudos [?]: 91 [0], given: 0

Schools: MIT Sloan

### Show Tags

02 May 2007, 22:50
Yes, the answer for (2) must be B.
However, the reference key gives A !

For the 1st problem, I followed the below approach,

Hard copies - 36000

# Hard copies sold after paper back was introduced - x

hence total# hard copies sold = (36000 + x)

hence total paperbacks = 9(36000 + x)

=> 10(36000 + x) = 441000 => paper copies = 396900 ! E

What is it I am missing here ?

Kudos [?]: 91 [0], given: 0

Senior Manager
Joined: 19 Feb 2007
Posts: 325

Kudos [?]: 68 [0], given: 0

### Show Tags

02 May 2007, 23:01
Yes, the answer for (2) must be B.
However, the reference key gives A !

For the 1st problem, I followed the below approach,

Hard copies - 36000

# Hard copies sold after paper back was introduced - x

hence total# hard copies sold = (36000 + x)

hence total paperbacks = 9(36000 + x)

=> 10(36000 + x) = 441000 => paper copies = 396900 ! E

What is it I am missing here ?

From the time the first paperback copy was sold until the last copy of the novel was sold. 9 times as many paperback copies as hardback copies were sold.

The statement says from the time the first paperback copy was sold............this implies papaerback copies are 9 times the hardcopies sold after the first paperback cpy was introduced.........i.e 9x and not 9 (36000 + x)...................now u can figure out the solution.

Kudos [?]: 68 [0], given: 0

Director
Joined: 13 Mar 2007
Posts: 542

Kudos [?]: 91 [0], given: 0

Schools: MIT Sloan

### Show Tags

02 May 2007, 23:39
oh cool .. thanks sid

Kudos [?]: 91 [0], given: 0

Manager
Joined: 04 Oct 2006
Posts: 76

Kudos [?]: 38 [0], given: 0

### Show Tags

03 May 2007, 01:11
hardback = h
paperback = p

36 000 + h + p = 441 000
p= 9h <=> h = p/9

36 000 + p/9 + p = 441 000

p = 405 000 * 9/10

Kudos [?]: 38 [0], given: 0

VP
Joined: 08 Jun 2005
Posts: 1143

Kudos [?]: 254 [0], given: 0

### Show Tags

03 May 2007, 03:00
My way:

441,000 = all books

441,000 - 36,000 = 405,000 (we don't care about hardback)

ratio p9:h1 = 9+1 = 10

405,000/10 = 40,500

we need only paperback

40,500*9 = 364,500

Kudos [?]: 254 [0], given: 0

Intern
Joined: 25 Apr 2007
Posts: 3

Kudos [?]: [0], given: 0

### Show Tags

03 May 2007, 13:17
i got A (none) for the 2nd problem..

If y ≠ 3 and (3x/y) is a prime integer greater than 2, which of the following must be true?
x = y
y = 1
x and y are prime integers.

looking at the question i made the example, 3 * 14 / 6 = 7, so x=14 y=6 and it equals a prime integer (7)

in this 1 example, x doesn't equal y, y doesn't equal 1, and neither x nor y is prime.. so none must be true

what are you guys thinking that i'm missing?

Kudos [?]: [0], given: 0

Director
Joined: 25 Oct 2006
Posts: 634

Kudos [?]: 647 [0], given: 6

### Show Tags

03 May 2007, 14:36
thanks uhmno, dat's right, I missed out the same too.

A is OK. Thanx for the example.

Kudos [?]: 647 [0], given: 6

Director
Joined: 25 Oct 2006
Posts: 634

Kudos [?]: 647 [0], given: 6

### Show Tags

03 May 2007, 14:39
Month Average Price per Dozen
April \$1.26
May \$1.20
June \$1.08
The table above shows the average (arithmetic mean) price per dozen of the large grade A eggs sold in a certain store during three successive months. If as many dozen were sold in April as in May, and twice as many were sold in June as in April, what was the average price per dozen of the eggs sold over the three-month period?
(A) \$1.08
(B) \$1.10
(C) \$1.14
(D) \$1.16
(E) \$1.18

OA is D, I got E

Kudos [?]: 647 [0], given: 6

VP
Joined: 08 Jun 2005
Posts: 1143

Kudos [?]: 254 [0], given: 0

Re: Can anybody explain this? [#permalink]

### Show Tags

03 May 2007, 14:53
priyankur_saha@ml.com wrote:
Month Average Price per Dozen
April \$1.26
May \$1.20
June \$1.08
The table above shows the average (arithmetic mean) price per dozen of the large grade A eggs sold in a certain store during three successive months. If as many dozen were sold in April as in May, and twice as many were sold in June as in April, what was the average price per dozen of the eggs sold over the three-month period?
(A) \$1.08
(B) \$1.10
(C) \$1.14
(D) \$1.16
(E) \$1.18

OA is D, I got E

April - number of dozen eggs sold - x - average 1.26\$
May - number of dozen eggs sold - x - average 1.20\$
June - number of dozen eggs sold - 2x - average 1.08\$

average for three months:

(1.26x+1.2x+1.08*2x)/4x = (total price for dozen eggs/number of dozen eggs sold)

4.62x/4x = 4.62/4 = 1.155 ~ 16

Kudos [?]: 254 [0], given: 0

Intern
Joined: 01 Feb 2007
Posts: 17

Kudos [?]: [0], given: 0

### Show Tags

03 May 2007, 17:27
Yeah D is correct . Same method

Kudos [?]: [0], given: 0

Director
Joined: 25 Oct 2006
Posts: 634

Kudos [?]: 647 [0], given: 6

### Show Tags

03 May 2007, 19:34
Thanks for the explanation. I messed up with the question stem. It was pretty easy one

Kudos [?]: 647 [0], given: 6

Director
Joined: 25 Oct 2006
Posts: 634

Kudos [?]: 647 [0], given: 6

### Show Tags

03 May 2007, 19:41
I need explanation for this too...
At a certain diner, a hamburger and coleslaw cost \$3.59, and a hamburger and french fries cost \$4.40. If french fries cost twice as much as coleslaw, how much do french fries cost?
(A) \$0.30
(B) \$0.45
(C) \$0.60
(D) \$0.75
(E) \$0.90

Suppose H + C = 3.59; H + F = 4.40
So F - C = 4.40 - 3.59 = 0.81
Again, F = 2C.
Then, 2C - C = 0.81 & C = 0.81, and F = 2C = 1.62

Is that right?? But not in answer choice??

Kudos [?]: 647 [0], given: 6

VP
Joined: 08 Jun 2005
Posts: 1143

Kudos [?]: 254 [0], given: 0

### Show Tags

04 May 2007, 02:35
priyankur_saha@ml.com wrote:
I need explanation for this too...
At a certain diner, a hamburger and coleslaw cost \$3.59, and a hamburger and french fries cost \$4.40. If french fries cost twice as much as coleslaw, how much do french fries cost?
(A) \$0.30
(B) \$0.45
(C) \$0.60
(D) \$0.75
(E) \$0.90

Suppose H + C = 3.59; H + F = 4.40
So F - C = 4.40 - 3.59 = 0.81
Again, F = 2C.
Then, 2C - C = 0.81 & C = 0.81, and F = 2C = 1.62

Is that right?? But not in answer choice??

hi priyankur_saha@ml.com - can you please post new topics as new subject ? so every question will be separate from the others.
you will get more viewers that way.

Thanks

Kudos [?]: 254 [0], given: 0

04 May 2007, 02:35
Display posts from previous: Sort by

# There were 36.000 hardback copies of a certain novel sold

Moderator: chetan2u

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.