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If P >0 and P % of 3P is P % less than P, then P equal

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If P >0 and P % of 3P is P % less than P, then P equal [#permalink] New post 30 Jul 2017, 08:20
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Question Stats:

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If P > 0 and P % of 3P is P % less than P, then P equals:

A. 5

B. 25

C. 40

D. 50

E. 64
[Reveal] Spoiler: OA

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Re: If P > o and P % of 3P is P % less than P, then P equal [#permalink] New post 05 Feb 2018, 04:53
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(p/100)(3p)=p-(p^2/100)
or, 3p^2=(100P-p^2)
or, p =25

So, the answer is B.
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Re: If P >0 and P % of 3P is P % less than P, then P equal [#permalink] New post 05 Feb 2018, 19:35
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Carcass wrote:


If P > 0 and P % of 3P is P % less than P, then P equals:

A. 5

B. 25

C. 40

D. 50

E. 64


Here it is given P% of 3P is P% less than P,

i.e we have \(\frac{P}{100} * 3P =\) \(P-(\frac{P}{100} * P)\)

or \(3P^2 =\) \(100P - P^2\)

OR \(4P = 100\)

OR \(P =25\) i.e option B
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Re: If P >0 and P % of 3P is P % less than P, then P equal [#permalink] New post 25 Feb 2018, 02:59
The wording "P % less than P" was confusing for me. I thought it's P - P/100 on the left-hand-side.
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Re: If P >0 and P % of 3P is P % less than P, then P equal [#permalink] New post 05 May 2018, 19:17
P-(\frac{P}{100} * P)
how you figured out this RHS like that?
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Re: If P >0 and P % of 3P is P % less than P, then P equal [#permalink] New post 06 May 2018, 04:18
Expert's post
These are basic rules of % GRE problems, however.

If you do nor re-brush your math skills then is difficult to attack more difficult questions.

Translating math into words

P % of 3P is P % less than P

P% means \(\frac{P}{100}\)

of 3P means * 3P

is means =

P% less than p means a certain quantity such as 100 less a certain % we could say 10% which is equal to 90%

As such, P - (P/100*P). If you wanna from 100 to arrive directly to 90 you multiply 100* 0.9 and the result is 90.

Hope this helps.

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Re: If P >0 and P % of 3P is P % less than P, then P equal [#permalink] New post 20 Aug 2018, 08:09
If P% less than P meant.

P - (p/100)* p

What does P% more than P mean??
would that equal to P + (P/100)*P
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Re: If P >0 and P % of 3P is P % less than P, then P equal [#permalink] New post 20 Aug 2018, 08:57
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Exactly.

Simpler, if you do have 100 or 80 or 75 you have to multiply for 100+15% (if the % change is 15 for instance)

100 * 1.15 = 115 or 80*1.15 you do have 100 or 80 plus 15% directly.

if you wanna take out the % you do 80 * 0.85% (100-15).

Hope this helps.
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Re: If P >0 and P % of 3P is P % less than P, then P equal [#permalink] New post 09 Jan 2019, 12:37
thanks
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Re: If P >0 and P % of 3P is P % less than P, then P equal [#permalink] New post 14 May 2019, 08:05
I was quite bogged down in the confusing p%p and so on. But I got it this way:
p-p%*3p=p%p [Since P%*3P <P by P%*P]
p=25.
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Re: If P >0 and P % of 3P is P % less than P, then P equal [#permalink] New post 14 May 2019, 08:24
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Quote:
If P > 0 and P % of 3P is P % less than P, then P equals:

A. 5

B. 25

C. 40

D. 50

E. 64


An alternative approach to the problem should the direct translation prove difficult is to use the choices and backsolve. When backsolving always attempt to logically eliminate any impossible choices. In this case, it might be possible to eliminate the largest two choices since, 50% of 3 x 50 would be a value larger than P itself and thus not satisfy the conditions of the problem.

Then we can take the middle remaining choice, in this case choice B 25 and walk through the steps to see if it matches the conditions of the problem. So, use the provided calculator to determine that 25% of 75 = 18.75. Now, check to see if 18.75 is 25% less than 25 by using the percent change formula which is (difference/original) x 100. In this case the difference is 6.25 and the original would be our plugged in value of p which is 25. 6.25 ÷ 25 = 0.25 x 100 = 25%, therefore choice B 25 matches all conditions of the problem and is the correct choice.
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Re: If P >0 and P % of 3P is P % less than P, then P equal   [#permalink] 14 May 2019, 08:24
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