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If a^6 + b^6 = 144 then the greatest possible value for b is between

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If a^6 + b^6 = 144 then the greatest possible value for b is between [#permalink]

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If a^6 + b^6 = 144 then the greatest possible value for b is between

A. 8 and 10
B. 6 and 8
C. 4 and 6
D. 2 and 4
E. 2 and 0
[Reveal] Spoiler: OA

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Re: If a^6 + b^6 = 144 then the greatest possible value for b is between [#permalink]

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New post 10 Sep 2017, 06:58
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greatest possible value of b is when a is zero.

so b^6 = 144
b^3 = 12 b = 2.xxx
b is between 3 and 4 so

Ans D

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Last edited by Ejiroghene on 10 Sep 2017, 08:20, edited 1 time in total.

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Re: If a^6 + b^6 = 144 then the greatest possible value for b is between [#permalink]

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New post 10 Sep 2017, 07:14
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It's a D. Between 2 and 4.

B is maximum when value of A is zero.

And since no condition has been given for A and B to be integers, so B can take decimal values also.

Again b^6=144
b^3=12.
So B can also be 2.1 or 2.2.
But it cannot be 3 or greater than 3.
So it has to be somewhere between 2 and 3.
So option D holds good in this case.



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If a^6 + b^6 = 144 then the greatest possible value for b is between [#permalink]

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New post 10 Sep 2017, 07:20
Bunuel wrote:
If a^6 + b^6 = 144 then the greatest possible value for b is between

A. 8 and 10
B. 6 and 8
C. 4 and 6
D. 2 and 4
E. 2 and 0


The question states that \(b^6 = 144-a^6\). Hence for \(b\) to be maximum \(a=0\)
so \(b^6=144\) taking square root of both the sides, we get
\(b^3 = 12\). Now,
\(8<12<27\) or \(8<b^3<27\). Taking cube root of the inequality we get
\(2<b<3\). Hence \(b\) is definitely greater than \(2\) but less than \(3\) (to be precise; \(b^3 = 12\), or \(b= 2.289428\))

Ideally the greatest possible value of \(b\) is between \(2\) & \(3\), but we don't have any option stating that.
Hi Bunuel can you confirm whether Option D is correct and there are no typo errors

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If a^6 + b^6 = 144 then the greatest possible value for b is between [#permalink]

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New post 16 Oct 2017, 22:47
niks18 wrote:
Bunuel wrote:
If a^6 + b^6 = 144 then the greatest possible value for b is between

A. 8 and 10
B. 6 and 8
C. 4 and 6
D. 2 and 4
E. 2 and 0


The question states that \(b^6 = 144-a^6\). Hence for \(b\) to be maximum \(a=0\)
so \(b^6=144\) taking square root of both the sides, we get
\(b^3 = 12\). Now,
\(8<12<27\) or \(8<b^3<27\). Taking cube root of the inequality we get
\(2<b<3\). Hence \(b\) is definitely greater than \(2\) but less than \(3\) (to be precise; \(b^3 = 12\), or \(b= 2.289428\))

Ideally the greatest possible value of \(b\) is between \(2\) & \(3\), but we don't have any option stating that.
Hi Bunuel can you confirm whether Option D is correct and there are no typo errors


niks18
hi

I agree with you completely
though I approached the problem similar way, I don't understand how everybody is claiming "b" to be between 2 and 4

certainly, we need some Bunuel here ..

Last edited by gmatcracker2017 on 17 Oct 2017, 00:56, edited 2 times in total.

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Expert Post
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Re: If a^6 + b^6 = 144 then the greatest possible value for b is between [#permalink]

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New post 16 Oct 2017, 23:22
Expert's post
gmatcracker2017 wrote:
niks18 wrote:
Bunuel wrote:
If a^6 + b^6 = 144 then the greatest possible value for b is between

A. 8 and 10
B. 6 and 8
C. 4 and 6
D. 2 and 4
E. 2 and 0


The question states that \(b^6 = 144-a^6\). Hence for \(b\) to be maximum \(a=0\)
so \(b^6=144\) taking square root of both the sides, we get
\(b^3 = 12\). Now,
\(8<12<27\) or \(8<b^3<27\). Taking cube root of the inequality we get
\(2<b<3\). Hence \(b\) is definitely greater than \(2\) but less than \(3\) (to be precise; \(b^3 = 12\), or \(b= 2.289428\))

Ideally the greatest possible value of \(b\) is between \(2\) & \(3\), but we don't have any option stating that.
Hi Bunuel can you confirm whether Option D is correct and there are no typo errors


niks18
hi

I agree with you completely
though I approached the problem similar way, I don't understand how everybody is claiming "b" to be between 2 and 4

certainly, we need some Bunuel here ..


The greatest possible value of b turns out to be ~2.3, which is indeed between 2 and 3, but it will also be true to say that it's between -1,000 and 10,000 isn't it? Between x and y, here means in the range from x to y. So, we can say that 2.3 is between 2 and 4.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 128565 [0], given: 12180

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Re: If a^6 + b^6 = 144 then the greatest possible value for b is between [#permalink]

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New post 17 Oct 2017, 00:57
gmatcracker2017 wrote:
niks18 wrote:
Bunuel wrote:
If a^6 + b^6 = 144 then the greatest possible value for b is between

A. 8 and 10
B. 6 and 8
C. 4 and 6
D. 2 and 4
E. 2 and 0


The question states that \(b^6 = 144-a^6\). Hence for \(b\) to be maximum \(a=0\)
so \(b^6=144\) taking square root of both the sides, we get
\(b^3 = 12\). Now,
\(8<12<27\) or \(8<b^3<27\). Taking cube root of the inequality we get
\(2<b<3\). Hence \(b\) is definitely greater than \(2\) but less than \(3\) (to be precise; \(b^3 = 12\), or \(b= 2.289428\))

Ideally the greatest possible value of \(b\) is between \(2\) & \(3\), but we don't have any option stating that.
Hi Bunuel can you confirm whether Option D is correct and there are no typo errors


niks18
hi

I agree with you completely
though I approached the problem similar way, I don't understand how everybody is claiming "b" to be between 2 and 4

certainly, we need some Bunuel here ..


thanks a lot to you Bunuel

you are super helpful
thanks 8-)

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Re: If a^6 + b^6 = 144 then the greatest possible value for b is between   [#permalink] 17 Oct 2017, 00:57
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