Xiaolong's height is 0.87 meters, and Xiaolong's father (Ms. Zhan) is twice as tall as him. How many meters is Mr. Zhan's height?
小龙的身高是0.87米，小龙的爸爸(詹老师)的身高是他的2倍，詹老师的身高是多少米？
<gadget id="calculator">0.87 * 2</gadget>
<output>1.74</output>

<result>1.74</result>