Question

at the start of the shift your part counter reads 250 at the end of the shift the part counter reads 1075 how many parts did you produce

Answer 1

This can be mathematically expressed to
 250 + X  = 1075
where X represents the parts you produce before the shift ends
Transpose 250 to the other side by subtracting each side by 250
Thus, it goes like this
X = 1075 - 250
X = 825

You produced 825 parts in the middle of the shift.