There are 22.5 inches in 5/8 of a yard. This is obtained by dividing 36 (the number of inches in a full yard) by 8 and multiplying the result (4.5) by 5. Ray

A cubic yard is 46,656 cubic inches. Spread to a thicknes of 5 inches, a cubic yard of concrete covers 9332.1 square inches, which is 64.8 square feet.

There are 210 inches in 5 yards a 2.5 feet: There are 3 feet in a yard, so 2.5 feet equals 5/6 of a yard. There are 5 and 5/6 yards total. There are 36 inches in a yard: (5+5/6)*36 = 210