Answer:
525 stitches
Explanation:
The circumference is 42 inches
To stitch 4 inches, it took 50 stitches
Lets find stitches PER INCH, so we divide 50 by 4, to get:
50/4 = 12.5 stitches PER INCH
We have to cover 42 inches, so the number of stitches needed is:
12.5 * 42 = 525 stitches in total