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A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:

18
24
42
81
Explanation:
Just go in reverse order.
Check the options with th subtracting 18 from each option for getting reverse number.
42 – 18 = 24 (which is in reverse).
So answer is 42.
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