First, Party A will finish the work in 12 days, and Party B will finish the work in 18 days. After six days of cooperation, Party B will do the rest of the work alone. How many days will it take to finish? If you have a unit, you need to write a formula

First, Party A will finish the work in 12 days, and Party B will finish the work in 18 days. After six days of cooperation, Party B will do the rest of the work alone. How many days will it take to finish? If you have a unit, you need to write a formula

First, Party A will finish the work in 12 days, and Party B will finish the work in 18 days. After six days of cooperation, Party B will do the rest of the work alone. How many days will it take to finish?
Party A and Party B cooperated for six days: 6 * (1 / 12 + 1 / 18) = 5 / 6
B: (1-5 / 6) / (1 / 18) = 3 days

After six days of cooperation, the rest was done by Party A alone. When it was finished, Party A worked for several days

A does 1 / 12 a day, B does 1 / 18 a day
A: 1-6 × (1 / 12 + 1 / 18)] 1 / 12 = 2 (days)
So a did it for eight days
Equation:
Set a working day x
X+/12+6×1/18=1
X=8