**A. mc/t = n/(d – n)(Correct)**

B. (m + c)/t = n/(d + n)

C. (t + c)/n = (d + n)/n

D. mc/t = (d – n)/t

Answering Exams

B. (m + c)/t = n/(d + n)

C. (t + c)/n = (d + n)/n

D. mc/t = (d – n)/t

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