Question

Brian is writing a paper that needs to be 20 pages long. He already wrote 8 pages and writes 4 pages each day. Write an algebraic equation to solve how many days it will take Brian to finish his paper. Let d equal the number of days

Answer 1

8+4d=20

4d=12

d=3

3 days

There are already 8 pages and then 4 a day, so you do 4 x d. Then put these as equals to 20 and solve it.