I just discovered the pragma 're' and I'm inetersted in using it. If I had the string: 
my $question="67.35 >= 50 && 67.35 < 80";

[download]
How would I complete the ev routine? 
#!C:/perl/bin/perl.exe

use warnings;
use strict;
use re 'eval';

my $question="67.35 >= 50 && 67.35 < 80";

my $ans=ev($question);
print "ans=$ans\n";

sub ev
{    ... ?
}

[download]

Or is there a better way?

In reply to using re 'eval' for varibable math by Anonymous Monk

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