Question

A number and its absolute value are equal. If you subtract two from the number, the new number and its absolute value are not equal. What do you know about the number?

Answer 1

A number and its absolute value are not equal when the number is less than zero. Since subtracting 2 makes the number less than zero, we know ...

... the number is a non-negative number less than 2. (0 ≤ n < 2)