So if you are going to get the 140 from 2 colours ....for evert 8 squares you cut...one row that is.....calculate 5 inches of fabric...
...if you need 16 squares... 2 rows...10 inches
...if you need 24 squares...3rows...15 inches...
...if you need 25 squares...4rows...20 inches...with extra fabric
the 2 1/2 yards will come from 2 fabrics....if you are making the same number from each of the 2 fabrics...just Half it...