问题
解答题
一个工厂一批零件，有483个合格，不合格的零件占总数的30%，这批零件有多少个不合格？
答案
483÷（1-30%）-483，
=483÷70%-483，
=690-483
=207（个）；
答：这批零件有207个不合格．
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一个工厂一批零件，有483个合格，不合格的零件占总数的30%，这批零件有多少个不合格？
483÷（1-30%）-483，
=483÷70%-483，
=690-483
=207（个）；
答：这批零件有207个不合格．
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