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Master Wang processes a batch of parts. He processes two fifths of these parts six days ago. At this speed, how many days will it take to finish processing these parts? Dear friends........ Help me....... I'll die if I can't finish my homework tonight
15 days
6×（2/5÷1）
=6×5/2
=15 days
To make a batch of parts, the original plan is to make 150 parts a day, but actually to make 30 more parts a day, we can finish the task 6 days ahead of time. How many parts are there in total?
equation
The original plan is to be completed in X days
(150+30)(x-6)=150x
180x-1080=150x
30x=1080
x=36
So this batch of parts has 150 × 36 = 5400 (pieces)
A factory has to complete a batch of parts processing tasks within 30 days. If 15 parts are processed every day and the tasks are completed on time, in the process of timing processing, there are six days, 14 parts are processed every day, 19 parts are processed every day, 15 parts are processed every day and 17 parts are processed every day. Please calculate the average number of parts processed every day in the remaining four days to complete the tasks on time
15 days a day, 30 days just right, indicating that the total number of 15 * 30 = 450
6 days * 14 = 84,
19 days * 15 = 285, plus 17, so 26 days processing number = 84 + 285 + 17 = 386,
There is a difference of 450-386 = 64, and the average daily processing of the remaining four days is 64 / 4 = 16
A factory plans to produce a batch of parts in June (30 days). It needs to produce 200 parts per day on average to complete the task. In fact, 1500 parts were produced in the first six days. According to this calculation, how many days will it take to complete the original planned task? (use positive and negative examples respectively)
Proportional example solution (constant work efficiency)
It will take X days to complete the original plan
3000 :6=(400×30) ：x
x=400×30×6÷3000
x=24
Inverse example solution (the total amount of work remains unchanged)
It will take X days to complete the original plan
3000÷6×x=400×30
500x=12000
x=12000÷500
x=24
There is no proportional solution
Let's use X days. Now we can finish 3000 / 500 per day
X = (30 × 400) △ 500 = 24 (days)
A: according to this calculation, it will take 24 days to complete the original plan
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