A 2-digit number , its unit digit is twice its tens digit.
So it's either 12, 24, or 36.
...the product of the two digits equals one third of the number.
The product of the digits of 12 is 1x2 = 2, But 2 is not 1/3 of 12.
The product of the digits of 24 is 2x4 = 8, and 8 is 1/3 of 24.
So that's the answer!
[No need to consider 36. For its product of digits is 18 which
isn't 1/3 of 36, for it's 1/2 of 36.]
Edwin
