Master Wang made a batch of spare parts. On the first day, he made the planned 4 / 3, and on the second day, he made the remaining 3 / 5. At this time, there were 42 spare parts left. How many spare parts did Master Wang make?

Master Wang made a batch of spare parts. On the first day, he made the planned 4 / 3, and on the second day, he made the remaining 3 / 5. At this time, there were 42 spare parts left. How many spare parts did Master Wang make?

Master shewang made x parts
(1-3/4)*(1-3/5)*X=42
X=420

Master Li finished 58% of the plan in the morning and 55% in the afternoon. On this day, Master Li overfulfilled a few percent of the plan

58%+55%-100%=13%
13% over schedule

Master Zhang wants to process a batch of parts. He completes 2 / 5 of the plan on the first day and 7 / 9 of the plan on the second day. What is actually completed exceeds the original plan

Excess = 2 / 5 + 7 / 9-1 = 2 / 5-2 / 9 = 18 / 45-10 / 45 = 8 / 45;
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