What is the tens digit of the positive integer “r”?
1) The tens digit of (r/10) is 3
2) The hundreds digit of (10r) is 6
r = abc
1. r/10 =ab.c, and the tens digit of r/10 is a =3, says nothing about b --->insufficient
2. 10r=abc0, and the hundreds digit of 10r is b =6, --> sufficient
B it is
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