20个苹果=30斤,
所以:5个苹果=7.5斤,所以1个苹果=1.5斤(好假=.=...)
5个苹果=3个火龙果,所以1个火龙果=2.5斤
5个苹果=2个梨,所以1个梨=3.75斤
5个苹果=4个菠萝,所以1个菠萝=1.875斤
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