Abstract : In [K. J. Lee and C. H. Park, $Some$ $questions$ $on$ $fuzzifications$ $of$ $ideals$ $in$ $subtraction$ $algebras$, Commun. Korean Math. Soc. $\bf 22$ (2007), no. 3, 359--363], Lee and Park posed three questions. In this paper, the affirmative answers to their questions are provided, and characterizations of fuzzy ideals are investigated.