i have three digits. the ones dijit and the ten's dijits are the same. the ten's digit is 3 less thantheb hundreds digit. the hundreds digit is 6. what am i ?

Let Ones digit=x

Tens digit=10y
Hundreds digit=100z

100z+10y+x=?
z=6
z-3=y
x=y

6-3=y=3=x

z=6
y=3
x=3

100(6)+10(3)+3= 633