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Manager  Joined: 18 Jan 2011
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If q is a positive integer, is p*q/q^(1/2) an integer?  [#permalink]

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1
10 00:00

Difficulty:   45% (medium)

Question Stats: 59% (01:22) correct 41% (01:19) wrong based on 220 sessions

### HideShow timer Statistics If $$q$$ is a positive integer, is $$p\frac{q}{\sqrt{q}}$$ an integer?

(1) $$q = p^2$$

(2) $$p$$ is a positive integer

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Originally posted by ravsg on 27 Apr 2011, 20:57.
Last edited by Bunuel on 02 Dec 2017, 06:26, edited 2 times in total.
Renamed the topic and edited the question.
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GMAT 1: 660 Q47 V34 Re: If q is a positive integer, is p*q/q^(1/2) an integer?  [#permalink]

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1) q=p^2
take the square root on both sides
p=(sqroot)q

so p*(q/(sqroot)q) = (sqroot)q * q/(sqroot)q = q
and from definition we know that q is a positive integer. sufficient

2)p is an integer
let p=2 and q=3 then the equation becomes 2 * 3 / (sqroot)3 which is not an integer
let p=2 and q=4 then the equations becomes 2 * 4 / (sqroot)4 = 4 which is an integer insufficient

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Re: If q is a positive integer, is p*q/q^(1/2) an integer?  [#permalink]

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If $$q$$ is a positive integer, is $$p\frac{q}{\sqrt{q}}$$ an integer?

(1) $$q = p^2$$. Take the square root from botth sides: $$p=\sqrt{q}$$. Substitute $$p$$: $$p\frac{q}{\sqrt{q}}=\sqrt{q}*\frac{q}{\sqrt{q}} = q = \text{integer}$$. Sufficient.

(2) $$p$$ is a positive integer. So, we have that $$p\frac{q}{\sqrt{q}}=\text{integer}*\sqrt{q}$$. This product may or may not be an integer depending on $$q$$. Not sufficient.

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Re: If q is a positive integer, is p*q/q^(1/2) an integer?  [#permalink]

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Expression given pq/q^1/2

this can be further simplified as (pq/q^1/2)*(q^1/2)/q^1/2

this will reduced to pq^1/2

1)q=p^2
since q is positive integer
the main expression will be =p^2. is an integer. Sufficient
2)p is positive integer.
this does not provide any solution. Insufficient

Manager  Joined: 10 Sep 2014
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Re: If q is a positive integer, is p*q/q^(1/2) an integer?  [#permalink]

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statement 1: sufficient
If q=p^2 and q is a positive integer, then p must also be an integer. After plugging in p^2 for Q in the question , then after reducing you see that it is equal to p^2.

statement 2: insufficient
If q=9 and p=2 then plug into the equation to get 6 as your answer. However, if you plug in q=6 and p=2, the equation does not equal an integer. not enough info.

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Re: If q is a positive integer, is p*q/q^(1/2) an integer?  [#permalink]

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In A - q = p^2 ,
=> sqroot(q) = sqroot(p^2); sqroot(q) = p

Question = p* q / sqroot(q) = p * q / p = q.

It is given q is positive hence it is positive.
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Re: If q is a positive integer, is p*q/q^(1/2) an integer?  [#permalink]

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_________________ Re: If q is a positive integer, is p*q/q^(1/2) an integer?   [#permalink] 13 Jan 2019, 02:53
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