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# If 75 gallons of water were added to a pool that is half full, the poo

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If 75 gallons of water were added to a pool that is half full, the poo  [#permalink]

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23 Oct 2019, 01:22
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Difficulty:

5% (low)

Question Stats:

88% (01:17) correct 13% (01:27) wrong based on 40 sessions

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If 75 gallons of water were added to a pool that is half full, the pool would then be 2/3 full. How many gallons of water does the pool hold when it is full?

A. 300
B. 360
C. 420
D. 450
E. 525

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Re: If 75 gallons of water were added to a pool that is half full, the poo  [#permalink]

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23 Oct 2019, 02:08
Bunuel wrote:
If 75 gallons of water were added to a pool that is half full, the pool would then be 2/3 full. How many gallons of water does the pool hold when it is full?

A. 300
B. 360
C. 420
D. 450
E. 525

Asked: If 75 gallons of water were added to a pool that is half full, the pool would then be 2/3 full. How many gallons of water does the pool hold when it is full?

2/3 - 1/2 = 1/6

Let the capacity of the pool be x
x/6 = 75
x = 450

IMO D
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Re: If 75 gallons of water were added to a pool that is half full, the poo  [#permalink]

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23 Oct 2019, 02:17
Bunuel wrote:
If 75 gallons of water were added to a pool that is half full, the pool would then be 2/3 full. How many gallons of water does the pool hold when it is full?

A. 300
B. 360
C. 420
D. 450
E. 525

from given info
75+x/2=2x/3
solve for x= 450
IMO D
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If 75 gallons of water were added to a pool that is half full, the poo  [#permalink]

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23 Oct 2019, 05:20

Solution

Given:
• 75 gallons of water were added to a pool that is half full
o The pool would then be $$\frac{2}{3}$$ full

To find:
• How many gallons of water does the pool hold when it is full?

Approach and Working Out:
• 75 gallons of water fills $$\frac{2}{3} – \frac{1}{2} = \frac{1}{6}^{th}$$ of the tank

Therefore, a full tank holds 6 * 75 gallons of water = 450 gallons

Hence, the correct answer is Option D.

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Re: If 75 gallons of water were added to a pool that is half full, the poo  [#permalink]

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23 Oct 2019, 08:20
Bunuel wrote:
If 75 gallons of water were added to a pool that is half full, the pool would then be 2/3 full. How many gallons of water does the pool hold when it is full?

A. 300
B. 360
C. 420
D. 450
E. 525

Let the total capacity of the pool be 6x

Now, $$3x + 75 = 4x$$

Or, $$x = 75$$

So, The total capacity of the pool is $$75*6 = 450$$ , Answer must be (D)
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Re: If 75 gallons of water were added to a pool that is half full, the poo  [#permalink]

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27 Oct 2019, 19:52
Bunuel wrote:
If 75 gallons of water were added to a pool that is half full, the pool would then be 2/3 full. How many gallons of water does the pool hold when it is full?

A. 300
B. 360
C. 420
D. 450
E. 525

We can let n = the full capacity of the pool, in gallons, and create the equation:

75 + n/2 = 2n/3

Multiplying by 6, we have:

450 + 3n = 4n

450 = n

Alternate Solution:

When we add the 75 gallons, the pool’s capacity has increased from ½ to ⅔. Thus, 75 gallons is (⅔ - ½) = 4/6 - 3/6 = 1/6 of the entire capacity of the pool. Thus, the total capacity of the pool is 75 x 6 = 450 gallons.

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Re: If 75 gallons of water were added to a pool that is half full, the poo   [#permalink] 27 Oct 2019, 19:52
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