How much hay ? (1797)

A lent B a solid stack of hay, measuring 20 feet every way. Sometime afterward, B returned a quantity, measuring every way 10 feet. What proportion of the hay remains due ?

Answer : 7/8

Source: A New and Complete System of Arithmetic, Composed for the use of the citizens of the United States, Nicolas Pike, Worcester Massachusetts, 2nd edition, 1797

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