Question

In a 3-digit prime number sum of its digit is 5. If the ones and hundreds digits are interchanged. It still remains prime number. What is original number and what in the changed number

Answer 1

Here is a question which is really troublesome:

Let N be a 2 digit prime number. When the digits are interchanged we get another prime number M.

If M + N =176, find N-M.

Answer 2

Answer:

Number is 113.

Reverse is 331.