Dad is 1.7 meters tall and Xiaohong is 1.2 meters tall. How many meters taller is Dad than Xiaohong?
爸爸身高1.7米，小红身高1.2米．爸爸比小红高多少米？
<gadget id="calculator">1.7 - 1.2</gadget>
<output>0.5</output>

<result>0.5</result>