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1 gross = 144 → ½ gross = ½ × 144 = 72
A squares sides are equal in length. The answer is 4*5"=20".
There are 2.54 cm in an inch.
Same as 1 x 144...
In 1947 the government sold the "Big Inch" and the "Little Inch," two petroleum pipelines that had carried crude oil and gasoline from the Southwest to the Northeast during World War II.