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

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Manager
Joined: 10 Oct 2008
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If Henry were to add 5 gallons of water to a tank that is [#permalink]

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05 Nov 2008, 16:26
00:00

Difficulty:

5% (low)

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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05 Nov 2008, 17:03
1
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7/8x-3/4x=5galls

1/8*x=5gallons

x=40 gallons

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Manager
Status: suffer now and live forever as a champion!!!
Joined: 01 Sep 2013
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Location: India
GPA: 3.5
WE: Information Technology (Computer Software)

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

1/8*x=5gallons

x=40 gallons

Hi guys ,

alternative methos is :

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

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Manager
Joined: 07 Jun 2017
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Location: India
Concentration: Technology, General Management
GMAT 1: 660 Q46 V38
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Re: If Henry were to add 5 gallons of water to a tank that is [#permalink]

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07 Nov 2017, 21:16
3/4x+5 = 7/8x
24x+160 = 28x
x = 40
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Naveen
email: nkmungila@gmail.com
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Target Test Prep Representative
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Re: If Henry were to add 5 gallons of water to a tank that is [#permalink]

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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

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Jeffery Miller

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

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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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