Mark made a chalkboard that is 3 feet wide. It is 2 times as long as it is wide. What is the area of the chalkboard?
The length of the chalkboard is 2 x the width of 3 feet = <<2*3=6>>6 feet.
We can calculate area by multiplying the width and the length, so 3 feet x 6 feet = <<3*6=18>>18 feet.
#### 18