2x(3x6)
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47 Impossible problem!
Well, isn't that a happy little puzzle! Let's think about this together. Since the number is greater than 50 and has two digits, the only number that fits is 93. The digits are 9 and 3, with 3 being half of 9, and it's a lovely odd number!
1346
18. 1+8=9 9x2=18
If the lead digit cannot be zero then there are 9 x 9 x 8 x 7 = 4536 combinations. If the lead digit can be zero then there are, 10 x 9 x 8 x 7 = 5040 combination.