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Re: If a and b are positive integers, is a/b < 9/11 ? [#permalink]

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22 Oct 2015, 23:35

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Bunuel wrote:

If a and b are positive integers, is a/b < 9/11 ?

(1) a/b = 0,818 (2) b/a = 1,223

Kudos for a correct solution.

There is no need to calculate anything. We just need to know if we can ask the question: is a/b < 9/11?

1) a/b = 0,818 ->> Sufficient. You know that you COULD get the exact result and figure out if a/b is < 9/11. You do not even have to ballpark, all you need to know is, that you COULD. Sufficient. 2) b/a = 1,223 ->> Sufficient. The reciprocal would be a/b = 1/1,223, again, no need to calculate anything further, from this it is very clear that you can answer the question Y, or N.

Answer D.
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Re: If a and b are positive integers, is a/b < 9/11 ? [#permalink]

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22 Oct 2015, 23:50

reto wrote:

Bunuel wrote:

If a and b are positive integers, is a/b < 9/11 ?

(1) a/b = 0,818 (2) b/a = 1,223

Kudos for a correct solution.

There is no need to calculate anything. We just need to know if we can ask the question: is a/b < 9/11?

1) a/b = 0,818 ->> Sufficient. You know that you COULD get the exact result and figure out if a/b is < 9/11. You do not even have to ballpark, all you need to know is, that you COULD. Sufficient. 2) b/a = 1,223 ->> Sufficient. The reciprocal would be a/b = 1/1,223, again, no need to calculate anything further, from this it is very clear that you can answer the question Y, or N.

Re: If a and b are positive integers, is a/b < 9/11 ? [#permalink]

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16 Jun 2016, 19:17

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The statements here are posted incorrectly (this question is in GMAC OG 2016). Statement 1 is a/b < 0.818 and statement 2 is b/a > 1.223. So you do need to do calculations since it is not an equal sign.

The statements here are posted incorrectly (this question is in GMAC OG 2016). Statement 1 is a/b < 0.818 and statement 2 is b/a > 1.223. So you do need to do calculations since it is not an equal sign.

You are right. Edited. Thank you.
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Do we really need to calculate in this question? The answer will be either yes or no, but not both. The answer to any fraction, be it\(\frac{1000}{1224}\), \(\frac{1000}{1225}\) or any other will be different than \(\frac{9}{11}\).

Re: If a and b are positive integers, is a/b < 9/11 ? [#permalink]

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27 Dec 2016, 11:23

Guys could you post a compilation of these exotic rules for fractions? like that the number of 9's in the denominator defines the number of repeating decimals, etc?? Thank you!

Re: If a and b are positive integers, is a/b < 9/11 ? [#permalink]

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16 Mar 2017, 12:01

Bunuel wrote:

GinGMAT wrote:

The statements here are posted incorrectly (this question is in GMAC OG 2016). Statement 1 is a/b < 0.818 and statement 2 is b/a > 1.223. So you do need to do calculations since it is not an equal sign.

You are right. Edited. Thank you.

Even with the inequalities, do we need to calculate here?

If a and b are positive integers, is a/b < 9/11 ? [#permalink]

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23 Nov 2017, 22:35

Hadrienlbb wrote:

Same question as people above. This question is really easy with a calculator. A little less so without it, under stress and under 2 minutes.

Anyone willing to break down the mental math on this one? Because clearly approximation wither an option here.

Thanks,

Posted from my mobile device

Hi

Knowing the fractions to decimal conversions would help here. Eg:- 1/2 = 0.5, 1/3 = 0.333.., 1/4 = 0.25, 1/5 = 0.2, 1/6 = 0.1666.., 1/7 = 0.1428.., 1/8 = 0.125, 1/9 = 0.1111.., 1/10 = 0.1, 1/11 = 0.090909.., 1/12 = 0.08333.., and so on.

Its good to practice writing these from 1/2 to 1/20 often, because this could help you in various questions. Here in this question if we remember that 1/11 = 0.090909.. we would know that 9/11 = 9*0.090909.. = 0.818181..

Re: If a and b are positive integers, is a/b < 9/11 ? [#permalink]

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24 Nov 2017, 08:20

amanvermagmat wrote:

Hadrienlbb wrote:

Same question as people above. This question is really easy with a calculator. A little less so without it, under stress and under 2 minutes.

Anyone willing to break down the mental math on this one? Because clearly approximation wither an option here.

Thanks,

Posted from my mobile device

Hi

Knowing the fractions to decimal conversions would help here. Eg:- 1/2 = 0.5, 1/3 = 0.333.., 1/4 = 0.25, 1/5 = 0.2, 1/6 = 0.1666.., 1/7 = 0.1428.., 1/8 = 0.125, 1/9 = 0.1111.., 1/10 = 0.1, 1/11 = 0.90909.., 1/12 = 0.8333.., and so on.

Its good to practice writing these from 1/2 to 1/20 often, because this could help you in various questions. Here in this question if we remember that 1/11 = 0.90909.. we would know that 9/11 = 9*0.90909.. = 0.818181..

I actually tried that. I have a formula sheet with fractions/decimals/percents up to 12. So 1/9 = 0.111 and 1/11 = 0.0909

But again, going from 1/11 = 0.0909 to 9/11 = 0.8181 isn't exactly natural for me, unfortunately. I need to write down the multiplication/division, and that usually leads me to exceed the 2-minute mark.
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