Answer:
The expression (250 - 20 x) represents the pages he will have left after x days.
Step-by-step explanation:
Total number of pages in the book = 250
Number of books read by Andy per day = 20
⇒Number of pages read in x days = x ( Number of pages read per day)
= x (20) = 20 x
So, Andy read (20 x) pages in x days.
Now, the total pages left after x days = Total pages - Pages read in x days
= 250 - (20 x )
Hence, the expression (250 - 20 x) represents the pages he will have left after x days.
