GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 18 Aug 2018, 23:15

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

The hold of a fishing boat contains only cod, haddock, and halibut.

Author Message
TAGS:

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 47983
The hold of a fishing boat contains only cod, haddock, and halibut.  [#permalink]

Show Tags

28 Jul 2016, 05:23
00:00

Difficulty:

45% (medium)

Question Stats:

59% (01:20) correct 41% (01:08) wrong based on 82 sessions

HideShow timer Statistics

The hold of a fishing boat contains only cod, haddock, and halibut. If a fish is selected at random from the hold, what is the probability that it will be a halibut or a haddock?

(1) There are twice as many halibut as cod in the hold, and twice as many haddock as halibut.

(2) Cod account for 1/7 of the fish by number in the hold.

_________________
Senior Manager
Joined: 02 Mar 2012
Posts: 334
Schools: Schulich '16
Re: The hold of a fishing boat contains only cod, haddock, and halibut.  [#permalink]

Show Tags

28 Jul 2016, 06:06
1
get D

1)ratio of all 3 fish given
so probablity=6/7 for Halibut and haddock

2)same here
Retired Moderator
Joined: 26 Nov 2012
Posts: 598
The hold of a fishing boat contains only cod, haddock, and halibut.  [#permalink]

Show Tags

28 Jul 2016, 07:01
Bunuel wrote:
The hold of a fishing boat contains only cod, haddock, and halibut. If a fish is selected at random from the hold, what is the probability that it will be a halibut or a haddock?

(1) There are twice as many halibut as cod in the hold, and twice as many haddock as halibut.

(2) Cod account for 1/7 of the fish by number in the hold.

Asked to find the P (HA or HD)

Stat 1: If there is one cod(C) ..there are two Halibut(HB). C = 2HB.

then given twice as many haddcock(HD) as HB i.e. 4HB as it we know there are 2 HB...

C:HB:HD = 1:2:4 => Total 7 in number.

P (HB or HD) = 2/7 + 4/7 = 6/7...sufficient...

Stat 2: C = 1/7...we need to understand that probability of selecting of C is 1/7 then probability of selecting other two = 1 - 1/7 = 6/7..Sufficient..

OA please...will correct if I missed anything..
Manager
Joined: 07 Jul 2016
Posts: 79
GPA: 4
The hold of a fishing boat contains only cod, haddock, and halibut.  [#permalink]

Show Tags

28 Jul 2016, 07:29
Bunuel wrote:
The hold of a fishing boat contains only cod, haddock, and halibut. If a fish is selected at random from the hold, what is the probability that it will be a halibut or a haddock?

(1) There are twice as many halibut as cod in the hold, and twice as many haddock as halibut.

$$2c = l\\ 2l = a\\ \text{Total} = c + l + a = 7c$$

$$c = \frac{1}{7}$$

Sufficient (see below)

(2) Cod account for 1/7 of the fish by number in the hold.

$$\Pr{(\text{halibut }\cap \text{ haddock})} = 1 - \Pr{(\text{cod})}$$

$$\Pr{(\text{halibut }\cap \text{ haddock})} = \frac{6}{7}$$

Sufficient

(D) each statement alone is sufficient

_________________

Please press +1 Kudos if this post helps.

Director
Joined: 04 Jun 2016
Posts: 603
GMAT 1: 750 Q49 V43
Re: The hold of a fishing boat contains only cod, haddock, and halibut.  [#permalink]

Show Tags

04 Aug 2016, 04:35
Bunuel wrote:
The hold of a fishing boat contains only cod, haddock, and halibut. If a fish is selected at random from the hold, what is the probability that it will be a halibut or a haddock?

(1) There are twice as many halibut as cod in the hold, and twice as many haddock as halibut.

(2) Cod account for 1/7 of the fish by number in the hold.

(1) There are twice as many halibut as cod in the hold, and twice as many haddock as halibut.
Cod = x
Halibat =2x

Probablity of haddock or halibut = 6x/7x = 6/7
SUFFICIENT

(2) Cod account for 1/7 of the fish by number in the hold.
Cod = 1/7
total = 1/7+6/7= 7/7 = 1
Probablity of picking haddock and halibut = 6/7/1 = 6/7

SUFFICIENT
_________________

Posting an answer without an explanation is "GOD COMPLEX". The world doesn't need any more gods. Please explain you answers properly.
FINAL GOODBYE :- 17th SEPTEMBER 2016. .. 16 March 2017 - I am back but for all purposes please consider me semi-retired.

Non-Human User
Joined: 09 Sep 2013
Posts: 7754
Re: The hold of a fishing boat contains only cod, haddock, and halibut.  [#permalink]

Show Tags

02 Aug 2018, 17:47
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: The hold of a fishing boat contains only cod, haddock, and halibut. &nbs [#permalink] 02 Aug 2018, 17:47
Display posts from previous: Sort by

Events & Promotions

 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®.