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One more little thing about the code you posted:

The line

$a = Formula(" $n1 / $d1");

casts $a as a formula, which is treated as a function of whatever variables are allowed in the current context, which by default is just x. That means that WeBWorK won't complain if students enter a function of x as their answer.

You should probably have the following instead:

$a = Compute(" $n1 / $d1" );

This should recognize the correct answer as being a real number, which means that students will get a warning message if they enter a function of x, telling them that it is expecting a number.

Using "Compute" rather than "Real" has the advantage of preserving the formatting of the answer as you entered it, i.e. leaving it as a fraction rather than storing the decimal version.

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