Dad is 172cm tall, which is 18cm more than twice the height of Xiao Cong. How tall is Xiao Cong in cm?
爸爸身高172cm，比小聪身高的两倍还多18cm，小聪身高多少cm？
<gadget id="calculator">172 - 18</gadget>
<output>154</output>

<gadget id="calculator">154 / 2</gadget>
<output>77</output>

<result>77</result>