A floor tile is 3 decimeters long and 2 decimeters wide, what is its perimeter?
一地砖长3分米，宽2分米，那么它的周长是多少分米．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>