There is a five digit number. It has two prime digits (1 is not a prime number).
Third digit is the highest. Second digit is the lowest. First digit is one less than the
third digit. The fifth digit is half of the fourth. The sum of 4th and 5th is less than the
first. Find the number.
Can you do Division? Divide a loaf by a knife - what's the answer to that?
Lewis Carroll, Through the Looking Glass
The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?