Find Date range from batch

for ex: input=23
output= [20-30]


String age="23";
float fage = Float.parseFloat(age)/10;
System.out.println("Float age is :"+fage);
int iage=(int)fage;
System.out.println("Value of iage is :"+iage);
int mage=iage*10;
int mmage=(iage+1)*10;
String age1=mage+"-"+mmage;
System.out.println("Changed age is :"+age1);