Dad is 1.78 meters tall, Juanjuan is 1.46 meters tall, and Juanjuan is 0.51 meters taller than her father when standing on the stool. How high is the stool?
爸爸身高1.78米，娟娟身高1.46米，娟娟站在凳子上时比爸爸高0.51米．凳子高多少米？
<gadget id="calculator">1.78 - 1.46</gadget>
<output>0.32</output>

<gadget id="calculator">0.32 + 0.51</gadget>
<output>0.83</output>

<result>0.83</result>