There are 3 bundles in a square and you have 2 squares so 6 bundles.
There are 3 bundles of conventional shingles to a square, so 3 X 27
3
21
3 bundles per square on average. So 3.5 square is 10 bundles.
Standard fiberglass shingles come 3 bundles to the square.
6x6 is 36 square feet, so just over 1 bundle. 3 bundles in a square which is 100 square feet. When using the common '3 Tab' shingles, 3 bundles = 1 square. Various manufacturers make higher end shingles that are installed differently and require 4 bundles to equal 1 square.
3
How many bundles of 3-Tab Shingles are needed to cover 80 square feet?
If your shingles say they cover 3 bundles to a square ( 10'x10' or 100 sq. ft) then one and a half. Some thicker, heavier shingles are 4 bundles to a square so you'd need 2.
9 bundles assuming std. 3 bundle/sq. shingles
20 year = 4 to a square. 30 year = 3 to a square. Most 20 year are also 3 bundles per square
Typically there are three (3) bundles per square (100 sq ft)