Question

please...answer it fast..​

Answer 1

Answer:

20/11 days. ...............

Answer 2

Answer:

Let A and B work for 20- days and then A- alone completes the work in N- days, then

(20+N)/80 + 20/100 = 1

So 5(20+N)+ 4(20) = 400

So 5N= (400- 180)= 220

So N= 220/5= 44- days