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.

# Answer

18
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
18
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?
train