The frame of the blackboard is made of 5.4 meters of metal, and the length is 3.5 times the width. What is the area of the blackboard?
黑板边框用了5.4米的金属，长是宽的3.5倍，黑板的面积是多少？
<gadget id="calculator">5.4 / 2</gadget>
<output>2.7</output>

<gadget id="calculator">1 + 3.5</gadget>
<output>4.5</output>

<gadget id="calculator">2.7 / 4.5</gadget>
<output>0.6</output>

<gadget id="calculator">0.6 * 3.5</gadget>
<output>2.1</output>

<gadget id="calculator">0.6 * 2.1</gadget>
<output>1.26</output>

<result>1.26</result>