Answer:
He spent 1.89 for 1 spool of thread
Explanation:
1) 8.99 x 3 = 26.97 because He buys three yards of fabric at $8.99 per yard
2) 32.64 - 26.97 = 5.67 because we need to figure out what part of the total was spent on the spool of thread.
3) 5.67 / 3 = 1.89 because he bought three spoils of thread and I want to know the price of one.