Question

Iam a 4 digit number. iam less than 5000 my hundreds digit is double my unit my tens digit is half of my unit digit. my thousand digit is the same as my unit digit. what number am I

Answer 1

The number must be of the form
2xx2
or
4xx4
since the units digit must be even (tens is half of units)
So that makes it easy to fill in the x's.