Question

Because of the green revolution, the average u.s. cornfield increased its yields by _____ during the 20th century.

Answer 1

Because of the green revolution, the average u.s. cornfield increased its yields by fivefold during the 20th century.
The Green Revolution was of utmost importance for farmers, and especially those who worked with corn, because it brought immense profits to them by providing them with 5 times as many corn than before.