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PS 1000- Section 2 #11

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by lavanya_25 » Mon May 07, 2007 7:55 am
Hi

Please help me solve this question from the 1000 series

. If 6 gallons of gasoline are added to a tank that is already filled to 3/4 of its capacity, the tank is then filled to 9/10 of its capacity. How many gallons does the tank hold?
(A) 20
(B) 24
(C) 36
(D) 40
(E) 60

Thanks
Lavanya
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Re: PS 1000- Section 2 #11

by Neo2000 » Mon May 07, 2007 8:19 am
lavanya_25 wrote:Hi

Please help me solve this question from the 1000 series

. If 6 gallons of gasoline are added to a tank that is already filled to 3/4 of its capacity, the tank is then filled to 9/10 of its capacity. How many gallons does the tank hold?
(A) 20
(B) 24
(C) 36
(D) 40
(E) 60

Thanks
Lavanya
3/4th= 75% while 9/10th = 90%
which means that addition of 6gallons caused a rise of 15%
So if there was 75% earlier that would mean there were 6x5 = 30gallons
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by Cybermusings » Mon May 07, 2007 9:05 am
If 6 gallons of gasoline are added to a tank that is already filled to 3/4 of its capacity, the tank is then filled to 9/10 of its capacity. How many gallons does the tank hold?
(A) 20
(B) 24
(C) 36
(D) 40
(E) 60

Suppose capacity is x
3x/4 + 6 = 9x/10
3x + 24 = 4*9x/10
3x + 24 = 18x/5
15x + 120 = 18x
3x = 120
x = 40
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Junior | Next Rank: 30 Posts
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The OA

by lavanya_25 » Mon May 07, 2007 9:49 am
The OA for this question is D. Thanks a lot for the response.

Lavanya
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