A two digit number is such that the product of its digits is 18.
When 63 is subtracted from the number, the digits interchange
their places.
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The product of the 2 digits is 18
∴The number could be 29, 36, 63 or 92.
If 63 is subtracted, the digits interchange.
∴We can find the number by using trail and error,
29-63 = -34 ≠ 92
36-63 = -27 ≠ 63
63-63 = 0 ≠ 36
92-63 = 29 = 29
∴92 is the required 2-digit number.
:)
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