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19 Sep 2003, 05:34
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a is divisible by 60 . b is not divisible by 21. Is a*b divisible by
48?
a. a*b is divisible by 540
b. a^2 * b is divisible by 36
after you get your answer, check my work and tell me whether i am right?
1. a*b is divisible by 540
a*b = 540 s
540 not a mutliple of 48 and so a*b not divisible by 48...
sufficient
2. a^2 * b is divisible by 36
a^2 * b = 36 q ... equation 1
we know a = 60 n ...equation 2
Divide 1 by 2 a* b = 36/60 qn
a* b = 6/10 qn
if qn= 80 or any other multiple of 80, yes ...but otherwise no
so insufficient
so A by itself is sufficient
thanks
48?
a. a*b is divisible by 540
b. a^2 * b is divisible by 36
after you get your answer, check my work and tell me whether i am right?
1. a*b is divisible by 540
a*b = 540 s
540 not a mutliple of 48 and so a*b not divisible by 48...
sufficient
2. a^2 * b is divisible by 36
a^2 * b = 36 q ... equation 1
we know a = 60 n ...equation 2
Divide 1 by 2 a* b = 36/60 qn
a* b = 6/10 qn
if qn= 80 or any other multiple of 80, yes ...but otherwise no
so insufficient
so A by itself is sufficient
thanks
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19 Sep 2003, 23:48
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I don't agree with this. Say a*b = 8640(=540*16). Here a=60 & b = 144. Meets all the conditions. and is divisible by 48. but if a*b = 540, its not divisible by 48. So Not sufficient.
Quote:
Agree with this. So 2 alone is insufficient.
Now, combine 1 & 2 -
Say a* b is 8640(a=60 and b=144) here all conditions are satisfied and is divisible by 48.
Now, say a* b is 540(a=60, b= 9) , here also all the conditions are satisfied but not divisible by 48.
So Insufficient.
Hence E.
Pls. let me know if I'm missing anything.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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