#Perl allows you to use numbers and strings interchangeably

#A loosely typed programming languages is typically one that does not require the type of a variable to be explicitly stated. (Java, C#, Pascal and C are strongly typed) Perl is a loosely typed language. You can put any type of data into a variable and perl will interpret it based on context: 

$myvariable = 25;
print $myvariable."\n";
$myvariable = "A String."; 
print $myvariable."\n";

$a=42;
print $a+18;
print "\n";

$b="50";
print $b-10;
print "\n";

$a=42/3;
print $a."Hello";  #using a number like a string
print "\n";

$a="Hello world";
print $a+6;  #use string like a number, perl use value 0 for the number
print "\n";