What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Yes, that would be possible to do.
To do it, you would simply need to add:
1 form calculation to your form that will do the sum of the two fields
1 condition that will check if that value is under the maximum.
The following guides will help you see how to do the calculations:
And the following with the condition:
Of course, if you happen to have any issues setting it up, just let us know.