答案
解:设去年甲种球鞋卖了x双,则乙种球鞋卖了(12200-x)双,由题意,得
(1+6%)x+(12200-x)(1-5%)=12200+50,
解得:x=6000,
∴乙种球鞋卖了6200双.
答:去年甲种球鞋卖了6000双,则乙种球鞋卖了6200双.
解:设去年甲种球鞋卖了x双,则乙种球鞋卖了(12200-x)双,由题意,得
(1+6%)x+(12200-x)(1-5%)=12200+50,
解得:x=6000,
∴乙种球鞋卖了6200双.
答:去年甲种球鞋卖了6000双,则乙种球鞋卖了6200双.