If you total flavoring is 11% then 3% flavoring is 27% of that. (3/11=27%)
So, 27+27+46=100. (You can do 5/11 or 100-54 for the remaining flavoring of the
three.)
There is no limit on the total flavoring level in the calculator, it's a changeable field.
Now, the advantage to thinking of flavoring this way is that the ratio of the individual flavors can be altered without changing the total flavoring level. Also the total flavoring level can be changed without altering the flavoring ratio. So if the flavoring level is right, but the strawberry is a tad too strong you can drop strawberry down to 20 and bump the honeydew and/or pear up.
(I like Dan's calculator because I think of flavoring the way it is presented in the spreadsheet.)