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If r and s are postive integers and the r/s is expressed as

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Director
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If r and s are postive integers and the r/s is expressed as [#permalink] New post 10 Dec 2006, 22:27
If r and s are postive integers and the r/s is expressed as a decimal, is r/s a terminating decimal?

(1) 90<r<100

(2)s=4

I think both (1) and (2) are needed to answr the question. But Power Prep says only (2) is sufficient.

But why?
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Intern
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 [#permalink] New post 10 Dec 2006, 22:37
answer it B...if s=4 it will be a terminating decimal...whether the no. lies between 90 -100 or 10 -20...

e.g..

lets take r as 95 thus 95/4 = 23.5 terminating

now take r as 17 thus 17/4 = 4.25 terminating...so if a no. is divided by 4 it is always going to be terminating...

hope this helps

cheers!!
Director
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 [#permalink] New post 10 Dec 2006, 23:34
Yes, agree with B... 4 as a multiplier will always yield a terminating decimal....
Senior Manager
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 [#permalink] New post 11 Dec 2006, 13:57
Agree with B

2, 4 and 8 always yield terminating decimal
  [#permalink] 11 Dec 2006, 13:57
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If r and s are postive integers and the r/s is expressed as

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