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The water level in a rectangular swimming pool measuring 60 [#permalink]
08 Mar 2011, 14:08

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This post received KUDOS

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A

B

C

D

E

Difficulty:

45% (medium)

Question Stats:

53% (02:31) correct
46% (01:22) wrong based on 244 sessions

The water level in a rectangular swimming pool measuring 60 feet by 25 feet is to be lowered by 6 inches. How many gallons of water must be removed? (1 cu ft = 7.5 gallons)

Re: Water recession [#permalink]
08 Mar 2011, 14:15

3

This post received KUDOS

Expert's post

tonebeeze wrote:

The water level in a rectangular swimming pool measuring 60 feet by 25 feet is to be lowered by 6 inches. How many gallons of water must be removed? (1 cu ft = 7.5 gallons)

a. 100 b. 250 c. 750 d. 1200 e. 5625

6 inches = 1/2 feet (there are 12 inches in a foot.), so 60*25*1/2=750 feet^3 of water must be removed, which equals to 750*7.5=5625 gallons.

Re: Water recession [#permalink]
21 Apr 2011, 04:22

Volume of the swimming pool where water needs to be lowered = 60 * 25 * 6/12 = 750 cu. ft Water in Gallons that needs to be removed = 750 * 7.5 = 5625 Gallons OA is E
_________________

Re: Water recession [#permalink]
10 Apr 2012, 17:49

Bunuel wrote:

tonebeeze wrote:

The water level in a rectangular swimming pool measuring 60 feet by 25 feet is to be lowered by 6 inches. How many gallons of water must be removed? (1 cu ft = 7.5 gallons)

a. 100 b. 250 c. 750 d. 1200 e. 5625

6 inches = 1/2 feet (there are 12 inches in a foot.), so 60*25*1/2=750 feet^3 of water must be removed, which equals to 750*7.5=5625 gallons.

Answer: E.

Can you explain why you multiply by 1/2? The problem doesn't say that you lower the pool by half but only by 6 inches. I would think that you would multiply by 1/2 if the question asked to lower the pool by 12.5 feet. What am i missing. Thank you very much!

Re: Water recession [#permalink]
10 Apr 2012, 23:49

Expert's post

bohdan01 wrote:

Bunuel wrote:

tonebeeze wrote:

The water level in a rectangular swimming pool measuring 60 feet by 25 feet is to be lowered by 6 inches. How many gallons of water must be removed? (1 cu ft = 7.5 gallons)

a. 100 b. 250 c. 750 d. 1200 e. 5625

6 inches = 1/2 feet (there are 12 inches in a foot.), so 60*25*1/2=750 feet^3 of water must be removed, which equals to 750*7.5=5625 gallons.

Answer: E.

Can you explain why you multiply by 1/2? The problem doesn't say that you lower the pool by half but only by 6 inches. I would think that you would multiply by 1/2 if the question asked to lower the pool by 12.5 feet. What am i missing. Thank you very much!

Two dimensions (60 feet and 25 feet) are given in feet, so we should express the third dimension in feet too: 6 inches = 1/2 feet.
_________________

Re: Water recession [#permalink]
11 Apr 2012, 17:12

Bunuel wrote:

bohdan01 wrote:

Bunuel wrote:

The water level in a rectangular swimming pool measuring 60 feet by 25 feet is to be lowered by 6 inches. How many gallons of water must be removed? (1 cu ft = 7.5 gallons)

a. 100 b. 250 c. 750 d. 1200 e. 5625

6 inches = 1/2 feet (there are 12 inches in a foot.), so 60*25*1/2=750 feet^3 of water must be removed, which equals to 750*7.5=5625 gallons.

Answer: E.

Can you explain why you multiply by 1/2? The problem doesn't say that you lower the pool by half but only by 6 inches. I would think that you would multiply by 1/2 if the question asked to lower the pool by 12.5 feet. What am i missing. Thank you very much!

Two dimensions (60 feet and 25 feet) are given in feet, so we should express the third dimension in feet too: 6 inches = 1/2 feet.[/quote]

Thanks. To follow up, how do you know what the third dimension is? It could be 10 feet where 6 inches would be 6/120 or it could be 1 foot where 6 inches would be 1/2. I assume you mention the third dimension since we are talking about the volume, but how can we assume anything about the third dimension?

Re: Water recession [#permalink]
11 Apr 2012, 23:20

Expert's post

bohdan01 wrote:

Thanks. To follow up, how do you know what the third dimension is? It could be 10 feet where 6 inches would be 6/120 or it could be 1 foot where 6 inches would be 1/2. I assume you mention the third dimension since we are talking about the volume, but how can we assume anything about the third dimension?

It seems that you misunderstood the question: questions is simple saying that 60*25*1/2=750 feet^3 of water is removed and asks to calculate how much is that in gallons.
_________________

Re: The water level in a rectangular swimming pool measuring 60 [#permalink]
12 Feb 2014, 15:35

Bunuel wrote:

fozzzy wrote:

Tricky question! What would be the difficulty level of this question bunuel

Look at the statistics in the original post: 45% answered incorrectly, so I'd say the difficulty level is ~650.

I don't think that in the real test they won't give you the relation feet inches. Even less now considering how many non american citizens are taking the test

Just a quick reflection Cheers! J

gmatclubot

Re: The water level in a rectangular swimming pool measuring 60
[#permalink]
12 Feb 2014, 15:35