Question

4.40 persons take 30 days to complete a work. How long will it take to complete the work. If
20 more persons join them?​

Answer 1

6.6 days is the answer by the equation if x1*y1=x2*y2

Answer 2

x×y=x²×y²

40×30=60×y²

1200/60 = y

20=y

It will take 20 days to complete the work if 20 more persons join them.