Two tames need 18 days to complete an engineering taks.Tame A have worked 3 days.Tame B have worked 4days.They have finished one fifth of the task.If team A complete the task by them selves they need ( )days.
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![Two tames need 18 days to complete an engineering taks.Tame A have worked 3 days.Tame B have worked 4days.They have finished one fifth of the task.If team A complete the task by them selves they need ( )days.](/uploads/image/z/1690409-65-9.jpg?t=Two+tames+need+18+days+to+complete+an+engineering+taks.Tame+A+have+worked+3+days.Tame+B+have+worked+4days.They+have+finished+one+fifth+of+the+task.If+team+A+complete+the+task+by+them+selves+they+need+%28+%29days.)
Two tames need 18 days to complete an engineering taks.Tame A have worked 3 days.Tame B have worked 4days.They have finished one fifth of the task.If team A complete the task by them selves they need ( )days.
Two tames need 18 days to complete an engineering taks.Tame A have worked 3 days.Tame B have worked 4days.They have finished one fifth of the task.If team A complete the task by them selves they need ( )days.
Two tames need 18 days to complete an engineering taks.Tame A have worked 3 days.Tame B have worked 4days.They have finished one fifth of the task.If team A complete the task by them selves they need ( )days.
答案:36 (days).
假设:总任务量为1,team A的工作速度为a/天,team B的工作速度为b/天,则据题意就有:
18×(a+b)=1
3a+4b=1/5
求解上述方程得到:a=1/45;b=1/30.
当team A独自完成剩余4/5任务时,据题意就有:4/5÷1/45=36 (days).
gkg
生是中国人,死是中国魂,想我看英文,简直不可能@