Three times a number plus half of this number equals 80.5, find this number.
一个数的3倍加上这个数的一半等于80.5，求这个数．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 + (1/2)</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">80.5 / (7/2)</gadget>
<output>23</output>

<result>23</result>