i am a number more than 30. I have more tens than ones. what number could i be?

Answer 1

could be:
31 32
40 41 42 43
50 51 ..... 54
....
90 91 92 .... 98

You did not restrict it to a 2 digit number, so
continue fulfilling both conditions,
e.g. 475 is one of them

There are an infinite number of those.