A farmer uses 3/4 of his field to plant corn, 1/6 of his field to plant beans

I don’t understand what you are asking but his land use in total is 0.9166 or 91.66%. Meaning he has 91.66% of his land used for corn and beans. The other crop will use 8.34% of his land adding up to 100.
The corn takes up the majority of the space at 75% land capacity while the beans only take up 0.1666% of his land.

thank you person

Explanation: very kind