How many positive two-digit whole numbers are divisible by 7 ?
(A) 11
(B) 9
(C) 15
(D) 12
(E) 13
The largest two-digit number that is a multiple of 7 is $7 \times 14=98$.

ANSWER: (C)

Thus, there are 14 positive multiples of 7 that are less than 100 .

However, this includes $7 \times 1=7$ which is not a two-digit number.

Therefore, there are $14-1=13$ positive two-digit numbers which are divisible by 7 .

(Note that these 13 numbers are 14, 21, 28, 35, 42, 49, 56, 63,70,77,84,91, and 98.)

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