Quick, how may days are in between 12/1/16 and 7/20/

Step-by-step explanation:

Let a be the total score of Div. A

Let b be the total score of Div. B

given,

as equation 1.

and

as equation 2.

Now multiply equation 2 by 1/20 to eliminate b to solve for a.

take this new equation as equation 3.

now we will use equation 1 + equation 3 to eliminate b to solve for a.

Div.A total score = 600

Average Score = Total Score / Number of students.