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flystud777
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 Posted: Sat Sep 06, 2008 9:01 pm Post subject: last weird question |
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explanations? i see 1 is sufficient. prime factors of 70 are 2, 5, 7
what about 2nd statement? why is that not sufficient? prime factors of 10 are 2 and 5. no other factors (i.e. 10 and 1 don't count as it says integers greater than 1)
any help would be appreciated.
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parallel_chase
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| Posted: Sun Sep 07, 2008 12:39 am Post subject: Re: last weird question |
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| flystud777 wrote: | explanations? i see 1 is sufficient. prime factors of 70 are 2, 5, 7
what about 2nd statement? why is that not sufficient? prime factors of 10 are 2 and 5. no other factors (i.e. 10 and 1 don't count as it says integers greater than 1)
any help would be appreciated. |
Statement I
xyz=70 = 2*5*7
There is no other way 70 can be product 3 integers without using 1.
Therefore, x+y+z = 14
Sufficient.
Statement II
10x = 7yz
CASE I
x = 14, y=4, z=5
yz = 20 = 4*5
10*14 = 7*4*5
There is no restriction in the question why x cant be 14
CASE II
x=7, y=2,z=5
7*10 = 7*2*5
Similarly, we can have infinite values for x , y and z Insufficient.
Hence A is the answer.
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flystud777
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| Posted: Sun Sep 07, 2008 11:56 am Post subject: |
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| got it. thanks.
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