Question

What is the tens digit of the positive integer r ? (1) the tens digit of \small \frac{r}{10} is 3. (2) the hundreds digit of 10r is 6.

Answer 1

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Step-by-step explanation:

Let , tens digit would be , so the question is

(1) The tens digit of r/10 is 3 --> --> tens digit of this number is , so . No info about . Not sufficient.

(2) The hundreds digit of 10r is 6 --> --> hundreds digit of this number is , so . Sufficient.

Answer: B.