400×(1+20%),
=400×1.2,
=480(米);
480×20÷400,
=9600÷400,
=24(天);
答:原计划要24天修完.
修一条公路,计划每天修400米,实际每天比原计划多修25%,实际用了20天修完,原计划要多少天修完?
修一条公路,计划每天修400米,实际每天比原计划多修25%,实际用了20天修完,原计划要多少天修完?
数学人气:274 ℃时间:2019-10-17 04:43:57
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