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# What is the tens digit of the positive integer r? 1. the

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Manager
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What is the tens digit of the positive integer r? 1. the [#permalink]  08 Nov 2005, 21:25
What is the tens digit of the positive integer r?

1. the tens digit r/10 is 3

2. The hundreds digit of 10r is 6
VP
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[#permalink]  08 Nov 2005, 22:07
B.

(1) says 100 digit is 3
Manager
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[#permalink]  09 Nov 2005, 08:36
I must agree. B is right.

eg. r = 560

10r = 5600

therefore the tens digit of r is 6.
Current Student
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Re: factors question [#permalink]  09 Nov 2005, 11:18
Jennif102 wrote:
What is the tens digit of the positive integer r?

1. the tens digit r/10 is 3

2. The hundreds digit of 10r is 6

B is the answer.

Assume number = abcd. We need to know the value of c.

(1) abcd/10 = abc.d --> Tens digit is b. Insufficient
(2) abcd * 10 = abcd0 --> hundereds digit is c. Sufficient.
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[#permalink]  09 Nov 2005, 11:26
agreed B is the right answer.
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Director
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[#permalink]  09 Nov 2005, 11:46
Why is B answer.. Can someone explain??
10r
65 * 10 = 650.. Hundred's digit is 6 but 10's digit is 5..
66 * 10 = 660.. Hundred's digit is 6 but 10's digit is 6.. so insufficient.
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Current Student
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[#permalink]  09 Nov 2005, 13:06
bewakoof wrote:
Why is B answer.. Can someone explain??
10r
65 * 10 = 650.. Hundred's digit is 6 but 10's digit is 5..
66 * 10 = 660.. Hundred's digit is 6 but 10's digit is 6.. so insufficient.

I think you interpreted the 2nd option incorrectly.

The ten's digit of the stem (in your case 65 and 66) is same as the 100's digit of 10r. We need to find the 10's digit of r and not 10r.

take other examples:

r =42 (10's digit = 4)
10r = 420 (100's digit = 4)
Manager
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[#permalink]  09 Nov 2005, 13:09
OA is B, thanks guys.
65*10 = 650
66 * 10 = 660
these are true cause the hundreds spot is 6 each time. However, the tens spot is ALSO 6 each time. the tens spot of r (65) is 6 and 66 is also 6.
[#permalink] 09 Nov 2005, 13:09
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# What is the tens digit of the positive integer r? 1. the

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