Four-fifth of all the students were gone.

英訳に間違いが有れば正してください。

生徒の5分の4がいなくなった。
Four-fifth of all the students were gone.

ヒント
5分の4

答え Four-fifthsにする

Four-fifths of all the students were gone.

分子複数なら分母も複数。
one-fifth
two-fifths