Which equation can be used to represent "three minus the difference of a number and one equals one-half of the difference of three times the same number and four”?

“The difference of a number and one” is n − 1, so “three minus” that difference is 3 − (n − 1). “The difference of three times the same number and four” is 3n − 4; one-half of it is ½(3n − 4). Together, these expressions give choice B.

AI-written and checked against the verified answer.