|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
24 Feb 2026, 00:35
Kudos
Bookmarks
Hi Harsha Sir,
For the second solution where you have taken 5+x+8 - 5 => 40 -5 = 35 < 53... Shouldn't it be <58? Because 53 already considers the -5, and we're considering it again in the 5+x+8-5 calculation. Please do let me know if I have made a mistake in my understanding. Thanks!
For the second solution where you have taken 5+x+8 - 5 => 40 -5 = 35 < 53... Shouldn't it be <58? Because 53 already considers the -5, and we're considering it again in the 5+x+8-5 calculation. Please do let me know if I have made a mistake in my understanding. Thanks!
HarshavardhanR
24 Feb 2026, 01:30
Kudos
Bookmarks
Hey!
Thanks for bringing this up -- I think I miswrote. Let me help build clarity here!
Bottom line:
To effectively pump to a height of 40 (5+8+x, in our chart), given the resistance of 5, we would need a pump with a rating of at least 45.
i.e., the pump would need to have a rating of at least (5+8+x"+5") = 45. Our pump is rated at 58 feet, so this should not be a problem.
Hope this helps!
Harsha
Thanks for bringing this up -- I think I miswrote. Let me help build clarity here!
Bottom line:
To effectively pump to a height of 40 (5+8+x, in our chart), given the resistance of 5, we would need a pump with a rating of at least 45.
i.e., the pump would need to have a rating of at least (5+8+x"+5") = 45. Our pump is rated at 58 feet, so this should not be a problem.
Hope this helps!
Harsha
ledzep10
bhanu29
Joined: 02 Oct 2024
Last visit: 29 Apr 2026
Posts: 363
Own Kudos:
Given Kudos: 263
Location: India
Schools: Anderson '27 Booth '27 Foster '27 Haas '27 Kellogg '27 Kellogg Mashall '27 McCombs '27 Ross '27 Scheller '27 Tepper '27 Yale '27 Sloan (MIT) Stanford '27
GMAT Focus 1: 675 Q87 V85 DI79 
GMAT Focus 2: 715 Q87 V84 DI86
GPA: 9.11
WE:Engineering (Technology)
Products:
Schools: Anderson '27 Booth '27 Foster '27 Haas '27 Kellogg '27 Kellogg Mashall '27 McCombs '27 Ross '27 Scheller '27 Tepper '27 Yale '27 Sloan (MIT) Stanford '27
GMAT Focus 2: 715 Q87 V84 DI86
Posts: 363
Kudos:
276
27 Mar 2026, 05:42
Kudos
Bookmarks
Assume that with the farmer’s plan the resistance from friction in the system will contribute exactly 5 vertical feet to the system’s total. For each of the following possible heights from the surface of the water source to the top of the tank, select Yes if it meets the constraints of the plan as specified. Otherwise, select No.
1. Pump can pump upto 58 vertical feet. with 5 vertical feet resistance it becomes 53 vertical feet
and also at the inlet of irrigation system we need 10 psi pressure
We know that one vertical feet gives us psi of 0.43.
So 10 psi = 10/0.43 = 23.26
2. That means the distance from irrigation system inlet to the bottom of tank needs to be >= 23.26
20 feet, 2nd condition will fail, so NO
40 feet both conditions pass, so YES
60 feet 1st condition will fail. so NO
| [color=#000000]Yes[/color] | [color=#000000]No[/color] | |
| N | [color=#000000]20 feet[/color] | |
| Y | [color=#000000]40 feet[/color] | |
| N | [color=#000000]60 feet[/color] |
1. Pump can pump upto 58 vertical feet. with 5 vertical feet resistance it becomes 53 vertical feet
and also at the inlet of irrigation system we need 10 psi pressure
We know that one vertical feet gives us psi of 0.43.
So 10 psi = 10/0.43 = 23.26
2. That means the distance from irrigation system inlet to the bottom of tank needs to be >= 23.26
20 feet, 2nd condition will fail, so NO
40 feet both conditions pass, so YES
60 feet 1st condition will fail. so NO
