挖一条水渠,第一天挖了20%,第二天挖了60%,还剩320米没有挖.这条水渠长多少米?
题目
挖一条水渠,第一天挖了20%,第二天挖了60%,还剩320米没有挖.这条水渠长多少米?
答案
320÷(1-20%-60%)
=320÷20%
=1600(米)
答:这条水渠长1600米.
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