Master Jiang processes a batch of parts, if he makes 45 pieces a day, it will be completed four days later than planned, and if he adds 55 pieces a day, this batch of parts can be completed four days

Master Jiang processes a batch of parts, if he makes 45 pieces a day, it will be completed four days later than planned, and if he adds 55 pieces a day, this batch of parts can be completed four days ahead of schedule. Hello:

First of all, I'll help you change the title slightly. "Master Jiang processes a batch of parts, making 45 pieces a day, which is completed four days later than planned; If there are five more per day, it can be finished four days in advance. How many parts are there in this batch? " Because the sentence "if there are 55 more every day" is unreasonable. If you are a wage earner, the boss suddenly asks you to add 55 to 45. I guess you can't and can't do it!

Solution: Suppose it is completed within χ days.

45×(χ+4)=(45+5)×(χ-4)

The solution is χ = 76.

By "If you do 45 things every day, you will finish it four days later than planned":

45× (76-4) = 3240 (pieces)

I hope you are satisfied!