Hello, -DQ-!

2) In a pack of construction paper the number of blue and red sheets

are originally in the ratio 2:7.

Each day, a gril uses 1 blue and 3 red sheets.

One day she uses 3 red sheets and the last blue sheet.

At this time there are 15 red remaining.

How many sheets of paper were in the pack originally?

Let = number of blue sheets.

Let = number of red sheets.

. . Hence, the pack contains sheets.

During the next days, she takes blue and red sheets.

Then the number of remaining sheets are: .

But we are told that the remaining sheets are: .

We have a system of equations: .

. . with the solution: .

Therefore, there were: . sheets originally.