Step-by-step explanation:
the description has some weird errors and can be confusing.
at the end, I think, the question is, in what day are they reading on the same page.
D = 17t + 49 (49 is the starting value on day t=0)
A = 20t + 2 (2 is the starting value on day t=0)
in other words the question is : for what t (day) are the equations equal ?
17t + 49 = 20t + 2
47 = 3t
t = 47/3 = 15.6666...
so, ob the 16th day they are on the same page.