It is currently 17 Dec 2017, 17:25

### 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

# Q. Water lily grows at such a rate that it covers double the

Author Message
Manager
Joined: 12 Sep 2006
Posts: 81

Kudos [?]: 18 [0], given: 0

Q. Water lily grows at such a rate that it covers double the [#permalink]

### Show Tags

28 Jan 2007, 19:17
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Q. Water lily grows at such a rate that it covers double the surface that it covered the day before. It takes 30 days for a water lily to cover the entire surface of the pond. How long would it take for two water lilies of the same size to cover the entire surface of the same pond?

A. 8.33
B. 12.5
C. 15
D. 20
E. 29

Q. The table below 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

Month Average Price per Dozen

April \$1.26
May \$1.20
June \$1.08

Thanks

Kudos [?]: 18 [0], given: 0

Director
Joined: 12 Jun 2006
Posts: 529

Kudos [?]: 172 [0], given: 1

### Show Tags

29 Jan 2007, 04:07
Quote:
Q. The table below 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

Month Average Price per Dozen

April \$1.26
May \$1.20
June \$1.08

Quote:
The table below shows the average (arithmetic mean) price per dozen of the large grade A eggs

1.26 = x/12 ---> x = 15.12
1.20 = x/12 ---> x = 14.40
1.08 = x/24 ---> x = 25.92

15.12 + 14.40 + 25.92 = 55.44

55.44/(12 + 12 + 24) = 55.44/48 = 1.155 = 1.16

I get D.

Is anyone up for solving the first one? I'd like to see a quick way to do that one.

Kudos [?]: 172 [0], given: 1

Intern
Joined: 09 Nov 2006
Posts: 10

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

### Show Tags

29 Jan 2007, 06:27
For #1 I would guess E..but this is just an educated guess..

Lets say that it were 8 days and it started off at a size of 1

So you get...1, 2, 4, 8, 16, 32, 64, 128.... well if two are growing then you have another 1, 2, 4, 8, 16, 32, 64, 128..at day 7 both are at a size of 64 so 64+64= 128 which is the size at day 8...day 7 is one day before day 8, hence how made an educated guess that the answer is (E) 29 days.....

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

Senior Manager
Joined: 01 Sep 2006
Posts: 301

Kudos [?]: 29 [0], given: 0

Location: Phoenix, AZ, USA
Re: Word Problems-- need help [#permalink]

### Show Tags

29 Jan 2007, 08:19
Q. Water lily grows at such a rate that it covers double the surface that it covered the day before. It takes 30 days for a water lily to cover the entire surface of the pond. How long would it take for two water lilies of the same size to cover the entire surface of the same pond?

A. 8.33
B. 12.5
C. 15
D. 20
E. 29

Let intial area be A
A become 2^1*A in 1 day and 2^2A in 2 days ... 2^30A in 30 days

With two lilies
we can have eqation

2^(n) * 2= 2^30*A

2^(n+1)A = 2^30A

n+1=30
n=29

Q. The table below 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

Month Average Price per Dozen

April \$1.26
May \$1.20
June \$1.08

Qty in April is A same in may A and hune its 2A
Average = total cost/Total qty

Avg = (A*1.26+A*1.2+2*A*1.08)/ A+A+2A
=(1.26+1.2+2.16)/4
=4.62/4=1.155

= 1.6

Kudos [?]: 29 [0], given: 0

Manager
Joined: 12 Sep 2006
Posts: 81

Kudos [?]: 18 [0], given: 0

### Show Tags

29 Jan 2007, 09:06
Thanks for the explanations friends.

Kudos [?]: 18 [0], given: 0

29 Jan 2007, 09:06
Display posts from previous: Sort by

# Q. Water lily grows at such a rate that it covers double the

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®.