vcbabu wrote:

Is a 3-digit number divisible by 6?

1). The sum of tens' and hundreds' digit is 6

2). The units' digit is 6

Neither statement is sufficient alone, clearly. Together:

-the sum of the digits is 12, so the number is divisible by 3

-the units digit is even, so the number is even, and thus divisible by 2

Since the number is divisible by both 2 and 3, it must be divisible by the LCM of 2 and 3, which is 6. C.

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