<|system|>
A domino consists of two congruent squares placed side by side. The perimeter of the domino is 60 units. What is the area of the domino, in square units?</s>.
<|user|>
Can you answer based on context?
<|assistant|>
Suppose that the domino's short side measures $l$ units.  Then it's long side measures $2l$ units, and the domino's total perimeter is $6l = 60$.  Thus $l = 10$ and the domino's area is $10\cdot 20 = 200$ square units.