Here's the mathematical limerick answer.

A Dozen, a Gross and a Score,
Plus three times the square root of four,
Divided by seven,
Plus five times eleven,
Equals nine squared and not a bit more.

Again, the original.

((12 + 144 + 20 + (3 * 4^(1/2))) / 7) + (5 * 11) = 9^2 + 0

I was unfamiliar with the carrot ^ being used to indicate the square function. But after I got that worked out, with ^1/2 half indicating square root and ^2 indicating square, it all made sense. But that ^ thing was new to me.