Now you can make a second quilt.
If math isn't your strong suit consider getting EQ, even an older version, or let a friend with EA help you. It is so easy to just put in the finished size of the blocks and 'fool around' to check for finished size.
OK ... I used to teach math and before work in statistics. I taught my students and we had fun. After all, once you drop the fear it is fun. There are only a few things you can do with numbers: leave them alone, make them go away (like multiply by zero, subtract by the same amount), make them bigger (addition and multiplication by greater than one, or division by lesser than one), or make them smaller (subtraction or multiply by less than one or division by greater than one.) Just have fun with it and relax!