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dber
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 Posted: Mon Mar 10, 2008 5:33 am Post subject: What is asked in the question |
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Help to understand what they ask? Is it total capacity of current volume of gasoline?
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 |
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camitava
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| Posted: Mon Mar 10, 2008 6:20 am Post subject: Re: What is asked in the question |
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| dber wrote: | Help to understand what they ask? Is it total capacity of current volume of gasoline?
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 |
Increase in water level: .9x - .75x = 6 so x = 40.
IMO D.
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Kekela
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| Posted: Mon Mar 10, 2008 6:52 am Post subject: |
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3/4x +6=9/10x --> 15x +120=18x -->120=3x ---> x=40  |
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dber
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| Posted: Mon Mar 10, 2008 7:20 am Post subject: |
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| I read "How many gallons does the tank hold?" as how many gallong are right now in tank. so it is 9\10 * 40 (total capacity) = 36... where am I wrong? |
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camitava
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| Posted: Mon Mar 10, 2008 7:49 am Post subject: |
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| dber wrote: | | I read "How many gallons does the tank hold?" as how many gallong are right now in tank. so it is 9\10 * 40 (total capacity) = 36... where am I wrong? |
Hey dber, I think, the Qs is asking for the total capacity of the tank but not the amount of water it is having now.
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