The height of a cow is 1.58 meters, and the height of an elephant is 0.3 meters more than twice the height of a cow. How tall is this elephant?
一头牛高1.58米，一头大象的高度是一头牛高度的2倍多0.3米．这头大象高多少米？
<gadget id="calculator">1.58 * 2</gadget>
<output>3.16</output>

<gadget id="calculator">3.16 + 0.3</gadget>
<output>3.46</output>

<result>3.46</result>