dam problem

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rijul007: Legendary Member; Posts: 588; Joined: Sun Oct 16, 2011 9:42 am; Location: New Delhi, India; Thanked: 130 times; Followed by:9 members; GMAT Score:720

dam problem

by rijul007 » Thu Nov 10, 2011 10:43 am

A certain dam regulates the volume of water that flows through its floodgates by reducing the area through which water can pass. Does the dam normally allow at least 30% of the maximum volume of water that can pass to flow through?

(1) The maximum volume of water that can pass through the floodgates is three times the volume which is normally allowed to flow through.

(2) The area through which water is allowed to pass is normally less than one third of maximum.

Option A

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Source: Beat The GMAT — Data Sufficiency | Thu Nov 10, 2011 10:43 am

amit2k9: Master | Next Rank: 500 Posts; Posts: 461; Joined: Tue May 10, 2011 9:09 am; Location: pune; Thanked: 36 times; Followed by:3 members

by amit2k9 » Thu Nov 10, 2011 11:03 am

a Normal = 10 Max = 30

30% of Max = 9. As 10>9, hence sufficient.

b Area|max = 30, Area| normal = 1-9.

30% of Max = 9. As the Q stem says at-least 30% meaning Normal >= 9.

thus not sufficient.

A it is.

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vaibhavgupta: Master | Next Rank: 500 Posts; Posts: 416; Joined: Tue Aug 30, 2011 2:18 pm; Location: Delhi, India; Thanked: 13 times; Followed by:9 members

by vaibhavgupta » Thu Nov 10, 2011 5:36 pm

rijul007 wrote:A certain dam regulates the volume of water that flows through its floodgates by reducing the area through which water can pass. Does the dam normally allow at least 30% of the maximum volume of water that can pass to flow through?

(1) The maximum volume of water that can pass through the floodgates is three times the volume which is normally allowed to flow through.

(2) The area through which water is allowed to pass is normally less than one third of maximum.

Option A

Option 1 ensures 33.33%

option 2 says it is less than 33.33% so it could be more than 30 i.e. 32 or less than 30% i.e. 28%

[spoiler]Hence Option A it is !![/spoiler]

If OA is A, IMO B
If OA is B, IMO C
If OA is C, IMO D
If OA is D, IMO E
If OA is E, IMO A

FML!! :/

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saketk: Legendary Member; Posts: 608; Joined: Sun Jun 19, 2011 11:16 am; Thanked: 37 times; Followed by:8 members

by saketk » Fri Nov 11, 2011 11:04 am

rijul007 wrote:A certain dam regulates the volume of water that flows through its floodgates by reducing the area through which water can pass. Does the dam normally allow at least 30% of the maximum volume of water that can pass to flow through?

(1) The maximum volume of water that can pass through the floodgates is three times the volume which is normally allowed to flow through.

(2) The area through which water is allowed to pass is normally less than one third of maximum.

Option A

Stmt 1- maximum volume allowed is 3 times the volume normally allowed to flow through. This means the volume normally allowed is 1/3rd of 33.33%, which is greater than 30%. So, A is sufficient.

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HSPA: Legendary Member; Posts: 1101; Joined: Fri Jan 28, 2011 7:26 am; Thanked: 47 times; Followed by:13 members; GMAT Score:640

by HSPA » Fri Nov 11, 2011 7:06 pm

when watering your garden and when you cover the tube 'outlet area' with thumb only the force increases but the volume released at the start of tube from tap will reach the plants.

Hope my analogy makes sense...

First take: 640 (50M, 27V) - RC needs 300% improvement
Second take: coming soon..
Regards,
HSPA.