Solution:
16 ÷ 21⁄4 = 71⁄9. Hence, I must buy 8 strips.
24 ÷ 3 = 8, which is the number of yards in a strip.
8 × 8 yards = 64 yards.
64 yards will cost 64 × 85c, or $54.40.
To this must be added the cost of sewing, the laying of the carpet, and the waste in matching the pattern.
Land Measure
Rule.—To find the number of acres in a tract of land, divide the number of square rods by 160, or number of square chains by 10.
Example: (1) How many square rods, also acres, in a field 80 rods long and 621⁄2 rods wide?
80 × 621⁄2 = 5000 square rods; 5000 ÷ 160 = 311⁄4 acres.