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A drought decreased the amount of water in city X’s reservoirs from 11

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Bunuel
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A drought decreased the amount of water in city X’s reservoirs from 11 [#permalink] New post   11 Dec 2015, 08:53
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A drought decreased the amount of water in city X’s reservoirs from 118 million gallons to 96 million gallons. If the reservoirs were at 79 percent of total capacity before the drought began, approximately how many million gallons were the reservoirs below total capacity after the drought?

A. 67
B. 58
C. 54
D. 46
E. 32
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C
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Divyadisha
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Re: A drought decreased the amount of water in city X’s reservoirs from 11 [#permalink] New post   11 Dec 2015, 14:44
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IMO 'C' is the answer
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vivekgautam1
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Re: A drought decreased the amount of water in city X’s reservoirs from 11 [#permalink] New post   12 Dec 2015, 00:02
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Bunuel wrote:
A drought decreased the amount of water in city X’s reservoirs from 118 million gallons to 96 million gallons. If the reservoirs were at 79 percent of total capacity before the drought began, approximately how many million gallons were the reservoirs below total capacity after the drought?

A. 67
B. 58
C. 54
D. 46
E. 32


Let capacity be 'c'
118 = 79% of c
i.e.
118 = \(\frac{79}{100}\) * c


or by ballparking,
120 = \(\frac{80}{100}\) * c

So, c =150

So, after the draught, the reservoir is 150 - 96 million gallons below the capacity, i.e. 54 million gallons.
So, [ans] 54
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Re: A drought decreased the amount of water in city X’s reservoirs from 11 [#permalink] New post   12 Dec 2015, 08:32
79/100(x)= 118
x~150

150-96=54



C. 54
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Re: A drought decreased the amount of water in city X’s reservoirs from 11 [#permalink] New post   14 Aug 2016, 05:36
anurag7mukharya wrote:
A drought decreased the amount of water in city X’s reservoirs from 118 million gallons to 96 million gallons. If the reservoirs were at 79 percent of total capacity before the drought began, approximately how many million gallons were the reservoirs below total capacity after the drought?

A. 67
B. 58
C. 54
D. 46
E. 32


This is how I tried...

Before drought reservoir has 118 MG and after drought 96 MG.

Now the question mentioned that 79 percent of total capacity before the drought.

let T be the total capacity of the reservoir.

Now we can equate before cases i.e 79/100(T) = 118.
Lets take approximate values for easy calculation 80/100(T) = 120 => T = 150 MG.

We need to subtract total - after drought case = 150 - 96 = 54 MG..

Option C is correct answer...
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Re: GMAT HELP?? [#permalink] New post   18 Mar 2020, 03:46
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Re: GMAT HELP?? [#permalink]
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