The elder sister is 1.68 meters tall, which is 0.8 meters less than twice the height of the younger brother. How tall is your brother? (solution by equation)
姐姐身高1.68米，比弟弟身高的2倍少0.8米．弟弟身高多少米？(用方程解)
<gadget id="calculator">1.68 + 0.8</gadget>
<output>2.48</output>

<gadget id="calculator">2.48 / 2</gadget>
<output>1.24</output>

<result>1.24</result>