mr.wang pianned to make many parts within 2 hours.there were still 160 parts left when the machine broke down .the efficiency was 20% lower than before .he had to use 20 more minutes to finish all the work .we can know there are ( ) parts in all.并
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/27 09:55:10
mr.wang pianned to make many parts within 2 hours.there were still 160 parts left when the machine broke down .the efficiency was 20% lower than before .he had to use 20 more minutes to finish all the work .we can know there are ( ) parts in all.并
mr.wang pianned to make many parts within 2 hours.
there were still 160 parts left when the machine broke down .the efficiency was 20% lower than before .he had to use 20 more minutes to finish all the work .we can know there are ( ) parts in all.
并能给我写出计算过程,答案应该是哪个?A 320 B 240 C 960 D 800
mr.wang pianned to make many parts within 2 hours.there were still 160 parts left when the machine broke down .the efficiency was 20% lower than before .he had to use 20 more minutes to finish all the work .we can know there are ( ) parts in all.并
There are 240 parts in all and Mr.Wang can make 2 parts every minutes.
当机器故障的时候,还有160块未完成。(因为机器的故障)工作效率比之前低了20%。他还需要20分钟来完成全部工作。我们知道一共有()块。
也就是说在20分钟完成160块每分钟8块以前的效率是8÷(1-20%)=10
没有告诉我时间哦。算不出一共多少块
2×60×10=1200
再加上160就是答案
1200+160=1360...
全部展开
当机器故障的时候,还有160块未完成。(因为机器的故障)工作效率比之前低了20%。他还需要20分钟来完成全部工作。我们知道一共有()块。
也就是说在20分钟完成160块每分钟8块以前的效率是8÷(1-20%)=10
没有告诉我时间哦。算不出一共多少块
2×60×10=1200
再加上160就是答案
1200+160=1360
收起