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Tens digit of r

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by exhilaration » Sat May 30, 2009 12:08 pm
Can anyone please explain this question?

Thanks!
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Source: — Data Sufficiency |
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by dmateer25 » Sat May 30, 2009 12:18 pm
Looking for the tens digit of positive integer r.

1)The tens digit of r/10 is 3

if r = 300

300/10 = 30. The tens digit of r is 0.

320/10=32. The tens digit of r is 2.

So this is Insuff

2) the hundreds digit of 10r is 6.

So the tens digit of r has to be 6.

10x60 = 600

Whatever the tens digit is when it multiplied by 10 will be the hundreds digit.

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by exhilaration » Sat May 30, 2009 12:22 pm
dmateer25 wrote:Looking for the tens digit of positive integer r.

1)The tens digit of r/10 is 3

if r = 300

300/10 = 30. The tens digit of r is 0.

320/10=32. The tens digit of r is 2.

So this is Insuff

2) the hundreds digit of 10r is 6.

So the tens digit of r has to be 6.

10x60 = 600

Whatever the tens digit is when it multiplied by 10 will be the hundreds digit.

B
Thanks!
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