When a workshop makes a batch of parts, it completes one fourth of the total number in the first day, two fifths of the total number in the second day, 50 parts in the first day, and how many parts in the second day

Let's do x the next day
Then 50 / 4 = x / 2 / 5
x=80

A workshop processes a batch of parts, two fifths of which are completed in the first day, a quarter of which are completed in the second day, and a total of 50 parts are completed in two days
A workshop processes a batch of parts, two fifths of which are completed in the first day, one fourth in the second day, and 50 in two days. How many parts are there in total?

Let there be x, then the first day is 2 / 5 x, and the second day is 1 / 4 times 2 / 5 X. The sum is 50, and the solution is 100