Combining numbers and strings for math

[gf]

I'm sure I'll slap my forehead when I see the answer, but it is sure
escaping me!

$field1 = 100; //Some number
$field2 = '/10'; //An operand and a divisor

I need $result = to be a numeric representation of 100/5 = 20.

I have fiddled with concatonation and eval() and haven't figured it out yet.
What's the answer?

Thanks.
--
Gaylen
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