The measures of a textbook are 22cm × 11 cm× 3cm. It is to be covered with paper. If each book requires 164 cm² of more paper for folding how much paper is need to wrap 85 such books?

If a text book is to be covered with paper

we have to cover top surface, bottom surface and one side surface

Area of top surface = Area of bottom surface = 22 cm X 11cm = 242 cm²

Area of the side surface = 22cm X 3 cm = 66 cm²

Total surface area to be covered = 242+ 242 + 66 = 550 cm²

Paper reqd for folding = 164 cm²

Total paper reqd for one book = 550 + 164 = 714 cm²

Total paper reqd for 85 books= 85 * 714 = 60690 cm² (Answer)