One square foot is 12in x 12in which means one square foot is equal to 144 square inches.
If 8 pieces of glass = 144 square inches
then let's multiply both sides since 144 x 6 = 864
(8 pieces of glass) x 6 = (144 square inches) x 6
so 48 pieces of glass = 864 square inches
The answer is B 48 pieces