Real life is a math word problem.
On par 3 holes if you hit from tee to green it shows both fairway and green were hit.
If the 9 you played had 2 par 3 holes that leaves just 7 actual fairways.
If you hit from tee to green on the par 3 holes, then missed a par 4 or 5 fairway that leaves 6 actual fairways you hit.
6/9 = 67%