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If Henry were to add 5 gallons of water to a tank that is

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If Henry were to add 5 gallons of water to a tank that is [#permalink]

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New post 05 Nov 2008, 16:26
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Question Stats:

90% (00:33) correct 10% (00:59) wrong based on 157 sessions

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If Henry were to add 5 gallons of water to a tank that is already 3/4 full of water, the tank would be 7/8 full. How many gallons of water would the tank hold if it were full?

A. 25
B. 40
C. 64
D. 80
E. 96
[Reveal] Spoiler: OA

Last edited by Bunuel on 23 Oct 2013, 06:25, edited 1 time in total.
Moved to PS forum and added the OA.

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Re: water(30) [#permalink]

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New post 05 Nov 2008, 17:03
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7/8x-3/4x=5galls

1/8*x=5gallons

x=40 gallons

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Re: water(30) [#permalink]

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New post 23 Oct 2013, 06:19
FN wrote:
7/8x-3/4x=5galls

1/8*x=5gallons

x=40 gallons


Hi guys ,

alternative methos is :
plugging through answers :)

Assume with 40 as answer , 7/8 = 35/40 , further reduce it by 5 then 30/40 =3/4 ;

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Re: If Henry were to add 5 gallons of water to a tank that is [#permalink]

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New post 07 Nov 2017, 21:16
3/4x+5 = 7/8x
24x+160 = 28x
x = 40
Answer B
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Re: If Henry were to add 5 gallons of water to a tank that is [#permalink]

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New post 08 Nov 2017, 17:44
Jcpenny wrote:
If Henry were to add 5 gallons of water to a tank that is already 3/4 full of water, the tank would be 7/8 full. How many gallons of water would the tank hold if it were full?

A. 25
B. 40
C. 64
D. 80
E. 96


We can create the following equation in which n = the capacity of the tank:

(3/4)n + 5 = (7/8)n

Multiplying the equation by 8, we have:

6n + 40 = 7n

40 = n

Answer: B
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Re: If Henry were to add 5 gallons of water to a tank that is   [#permalink] 08 Nov 2017, 17:44
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