After a storm deposits 115 billion gallons of water into the

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After a storm deposits 115 billion gallons of water into the [#permalink]

15 Feb 2013, 12:03

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After a storm deposits 115 billion gallons of water into the city reservoir, the reservoir is 80% full. If the original contents of the reservoir totaled 245 billion gallons, the reservoir was approximately what percentage full before the storm?

A. 45%
B. 48%
C. 54%
D. 58%
E. 65%

[Reveal] Spoiler: OA

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Last edited by Bunuel on 16 Feb 2013, 03:55, edited 1 time in total.

Edited the question.

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Re: After a storm deposits 115 billion gallons of water into the [#permalink]

15 Feb 2013, 21:35

When the storm deposited 115 billion gallons, volume of water in the reservoir = 245 + 115 = 360 billion gallons

If this is only 80% of the capacity of the reservoir, the total capacity of the reservoir = 360/0.8 = 450 billion gallons

Therefore percentage of reservoir that was full before the storm = (245/450)*100 = 54.4%

Option C
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Re: After a storm deposits 115 billion gallons of water into the [#permalink] 15 Feb 2013, 21:35

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After a storm deposits 115 billion gallons of water into the

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After a storm deposits 115 billion gallons of water into the

After a storm deposits 115 billion gallons of water into the

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