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99^9/9^99 or 11^9/9^90

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99^9/9^99 or 11^9/9^90 [#permalink] New post 22 Aug 2018, 09:19
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Question Stats:

61% (00:33) correct 38% (00:37) wrong based on 34 sessions
Quantity A
Quantity B
\(\frac{{99}^{9}}{{9^{99}}}\)
\(\frac{{11}^{9}}{{9}^{90}}\)


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.

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[Reveal] Spoiler: OA

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Re: 99^9/9^99 or 11^9/9^90 [#permalink] New post 22 Aug 2018, 10:07
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A very Smart Question Rather :

To solve or Compare the two Quantities we will try to get the Fraction ( In particular the Denominator Same for both Qty )

For Qty A we have the Following Situation :

99^ 9 / 9 ^ 99 = ( 11 * 9 ) ^ 9 / 9 ^99 --> 9^9(11^9)/ 9 ^ 99 --> 11^9 / 9 ^ 90 [ We divided or Took 9^ 9 out as Common ] .

So Both Qty are equal

ANSWER C
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Re: 99^9/9^99 or 11^9/9^90 [#permalink] New post 08 Jun 2019, 08:06
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Carcass wrote:
Quantity A
Quantity B
\(\frac{{99}^{9}}{{9^{99}}}\)
\(\frac{{11}^{9}}{{9}^{90}}\)


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.

Kudos for R.A.E


Key Concept: \((b^k)(c^k)=(bc)^k\)

We can also write: \((bc)^k=(b^k)(c^k)\)

Notice that we can rewrite 99 as (9)(11)
So....

GIVEN:
QUANTITY A: \(\frac{99^9}{9^{99}}\)

QUANTITY B: \(\frac{11^9}{9^{90}}\)


Rewrite 99 as (9)(11) to get:
QUANTITY A: \(\frac{[(9)(11)]^9}{9^{99}}=\frac{(9^9)(11^9)}{9^{99}}=\frac{11^9}{9^{90}}\)

QUANTITY B: \(\frac{11^9}{9^{90}}\)


Answer: C

Cheers,
Brent
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Re: 99^9/9^99 or 11^9/9^90   [#permalink] 08 Jun 2019, 08:06
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