Depends..... Are they standard three tab (20Yr) or Dimensionals (anywhere from 25yr to 50+.... some claim "lifetime") The amount of shingles in a bundle depend on the thickness of the shingle. 3 bundles in a square for most 20 yr and 4 bundles in a square for 30 - 40 yr.... and I have seen some that were 6 bundles. This is only for asphalt shingles, wood shingles usually are 5 bundles per square, maybe more depending a thickness...................
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them