Answer: 10 bushels
Explanation:
If they produce 100 barrels of oil using 100 worker hours, it means that the number of work hours taken for 1 barrel is:
= 100 / 100
= 1 work hour
For bushels however, 1 worker hour produces:
= 25 / 100
= 0.25 bushels of corn
If 60 barrels of oil are produced, it means 60 worker hours were used which would leave 40 worker hours.
Bushels of corn produced is therefore:
= 40 * 0.25
= 10 bushels