<h2><u>10 square feet</u> of the garden is planted with roses!</h2><h3></h3><h3>5 x 10 = 50 sq. ft.</h3><h3>50 x 0.20 = 10 sq. ft.</h3><h3></h3><h3><em>Please let me know if I am wrong.</em></h3>
I believe the correct answer would be C.
Number of books = 42 / 5/8 (Note 3 1/2 feet = 42 ins.)
= 42 * 8/5 = 336 / 5 = 67.2
67 books will fit on the shelf.