Solution: x= 125=2.4.
That is, it will be completed in 2.4 days.
(2) If the apprentice did it one day first, then the apprentice has already done one-sixth of the total workload that day, leaving five-sixths of the workload.
After a day's work, the apprentice will have to work for another y days to finish the rest of the workload.
The equation can be obtained from the meaning of the question: 1/4y+ 1/6y=5/6.
Solution: y=2,
Therefore, the apprentice * * * completed1/6× 2+1/6 =1/2 of the total workload.
1/4×2= 1/2 of the total workload completed by the master.
Answer: All the work done by master and apprentice is 1/2, and each person has to pay 450/2=225 yuan.