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GMATPrep: PS problem

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GMATPrep: PS problem [#permalink] New post 02 Apr 2008, 22:07
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Hi All,

Apparently this is a really simple problem but I can't seem to figure it out. It's a data sufficiency problem:

Is x + y < 1?

a) x < 8/9
b) y < 1/8

The answer is E (both aren't sufficient) but can someone explain why it's not C (both taken together are sufficient)?

Thanks,

Vik
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Re: GMATPrep: PS problem [#permalink] New post 02 Apr 2008, 22:53
sondenso wrote:
viktor1981 wrote:
Hi All,

Apparently this is a really simple problem but I can't seem to figure it out. It's a data sufficiency problem:

Is x + y < 1?

a) x < 8/9
b) y < 1/8

The answer is E (both aren't sufficient) but can someone explain why it's not C (both taken together are sufficient)?

Max of x = 8/9
Max 0f y= 1/8
Max x + Max y = 8/9+1/8 = 73/72 = 1 1/72
x+y can be 1 0.00000000001/72 so x+y>1
other case x+y can be less than 1

E
Thanks,

Vik



Techinically Max value of X cannot be 8/9 and Y cannot be 1/8. They are < and not <=
You can instead write equality like
x < 8/9 and Y < 1/9
so x + y < 1+1/72

Answer is still E though
Re: GMATPrep: PS problem   [#permalink] 02 Apr 2008, 22:53
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