NEW HERE? LEARN MORE
closeclose
Last visit was: 27 Apr 2024, 13:20 It is currently 27 Apr 2024, 13:20
Decision Tracker
My Rewards
New posts
New comers' posts

Close
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
Your Progress

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
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

Beginning at noon yesterday, water was added to a partially filled

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
User avatar
B
guddo
Manager
Manager
Joined: 25 May 2021
Posts: 155
Own Kudos [?]: 498 [7]
Given Kudos: 2
Send PM
Beginning at noon yesterday, water was added to a partially filled [#permalink] New post   19 Dec 2023, 11:11
1
Kudos
6
Bookmarks
00:00
A
B
C
D
E

Difficulty:

55% (hard)

Question Stats:

62% (01:40) correct 38% (01:36) wrong based on 134 sessions
Hide Show timer Statistics
Beginning at noon yesterday, water was added to a partially filled water tank at the constant rate of 500 gallons per hour. When there was a total of 2,000 gallons of water in the tank, no more was added. Was there more than 1,000 gallons of water in the tank at noon yesterday?

(1) There were 1,700 gallons of water in the tank at 1:00 yesterday afternoon.
(2) There were 2,000 gallons of water in the tank at 3:00 yesterday afternoon.

Show Spoiler
Attachment:
2023-12-19_17-44-06.png
2023-12-19_17-44-06.png [ 65.03 KiB | Viewed 1952 times ]
ShowHide Answer
Official Answer
A
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92956
Own Kudos [?]: 619470 [1]
Given Kudos: 81611
Send PM
CAT Tests Forum Quiz Mode
Re: Beginning at noon yesterday, water was added to a partially filled [#permalink] New post   19 Dec 2023, 11:23
1
Kudos
Expert Reply
guddo wrote:
Beginning at noon yesterday, water was added to a partially filled water tank at the constant rate of 500 gallons per hour. When there was a total of 2,000 gallons of water in the tank, no more was added. Was there more than 1,000 gallons of water in the tank at noon yesterday?

(1) There were 1,700 gallons of water in the tank at 1:00 yesterday afternoon.
(2) There were 2,000 gallons of water in the tank at 3:00 yesterday afternoon.

Show Spoiler
Attachment:
2023-12-19_17-44-06.png


Beginning at noon yesterday, water was added to a partially filled water tank at the constant rate of 500 gallons per hour. When there was a total of 2,000 gallons of water in the tank, no more was added. Was there more than 1,000 gallons of water in the tank at noon yesterday?

(1) There were 1,700 gallons of water in the tank at 1:00 yesterday afternoon.

Since 500 gallons of water were added in the hour from noon to 1:00 pm, there were 1,700 - 500 = 1,200 gallons of water in the tank at noon, which is more than 1,000 gallons. Sufficient.

(2) There were 2,000 gallons of water in the tank at 3:00 yesterday afternoon.

If the 2,000 gallons mark was reached at 12:30 pm, meaning the water addition lasted only half an hour, then the initial amount in the tank was 2,000 - 1/2*500 = 1,750 gallons, more than 1,000 gallons. However, if the 2,000 gallons mark was reached at 3:00 pm, meaning the water addition lasted three hours, then the initial amount in the tank was 2,000 - 3*500 = 500 gallons, less than 1,000 gallons. Not sufficient.

Answer: A.
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92956
Own Kudos [?]: 619470 [0]
Given Kudos: 81611
Send PM
CAT Tests Forum Quiz Mode
Re: Beginning at noon yesterday, water was added to a partially filled [#permalink] New post   24 Dec 2023, 00:59
Expert Reply
Similar question to practice (also from GMAT Prep Focus): https://gmatclub.com/forum/beginning-at ... 23200.html
User avatar
B
ashdank94
Intern
Intern
Joined: 20 Feb 2023
Posts: 31
Own Kudos [?]: 6 [0]
Given Kudos: 100
Send PM
Re: Beginning at noon yesterday, water was added to a partially filled [#permalink] New post   28 Mar 2024, 15:27
Hi Bunuel, why can't we use the explanation in Statement 2 in Statement 1? What if water was added only for half an hour
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92956
Own Kudos [?]: 619470 [1]
Given Kudos: 81611
Send PM
CAT Tests Forum Quiz Mode
Re: Beginning at noon yesterday, water was added to a partially filled [#permalink] New post   28 Mar 2024, 21:13
1
Kudos
Expert Reply
ashdank94 wrote:
Bunuel wrote:
guddo wrote:
Beginning at noon yesterday, water was added to a partially filled water tank at the constant rate of 500 gallons per hour. When there was a total of 2,000 gallons of water in the tank, no more was added. Was there more than 1,000 gallons of water in the tank at noon yesterday?

(1) There were 1,700 gallons of water in the tank at 1:00 yesterday afternoon.
(2) There were 2,000 gallons of water in the tank at 3:00 yesterday afternoon.

Show Spoiler
Attachment:
2023-12-19_17-44-06.png

Beginning at noon yesterday, water was added to a partially filled water tank at the constant rate of 500 gallons per hour. When there was a total of 2,000 gallons of water in the tank, no more was added. Was there more than 1,000 gallons of water in the tank at noon yesterday?

(1) There were 1,700 gallons of water in the tank at 1:00 yesterday afternoon.

Since 500 gallons of water were added in the hour from noon to 1:00 pm, there were 1,700 - 500 = 1,200 gallons of water in the tank at noon, which is more than 1,000 gallons. Sufficient.

(2) There were 2,000 gallons of water in the tank at 3:00 yesterday afternoon.

If the 2,000 gallons mark was reached at 12:30 pm, meaning the water addition lasted only half an hour, then the initial amount in the tank was 2,000 - 1/2*500 = 1,750 gallons, more than 1,000 gallons. However, if the 2,000 gallons mark was reached at 3:00 pm, meaning the water addition lasted three hours, then the initial amount in the tank was 2,000 - 3*500 = 500 gallons, less than 1,000 gallons. Not sufficient.

Answer: A.


Hi Bunuel, why can't we use the explanation in Statement 2 in Statement 1? What if water was added only for half an hour

­
In statement (1), we can definitively determine that the pump was active for the full hour between noon and 1:00 PM because the 1,700 gallons present at 1:00 PM are less than the 2,000-gallon capacity of the tank when the pumping ceases. Therefore, at noon, there must have been 1,700 - 500 = 1,200 gallons in the tank.

However, in statement (2), although we know there were 2,000 gallons in the tank at 3:00 PM, we can't ascertain how long the pump operated. It could have filled the tank completely by 12:30 PM and then ceased, or it could have continued for the entire three hours until 3:00 PM. The information provided in statement (2) doesn't give us a clear picture of the pump's operation time. Therefore, it doesn't allow us to determine the amount of water in the tank at noon accurately. It could have been pumping for the entire duration, or it could have reached the 2,000-gallon mark earlier, remaining at that level until 3:00 PM.
GMAT Club Bot
gmatclubot
Re: Beginning at noon yesterday, water was added to a partially filled [#permalink]
28 Mar 2024, 21:13
Moderator:
Bunuel
Math Expert
92956 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions