A number is 1.5 more than 80% of 20. What is the number?
一个数比20的80%多1.5，这个数是多少．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 * (4/5)</gadget>
<output>16</output>

<gadget id="calculator">16 + 1.5</gadget>
<output>17.5</output>

<result>17.5</result>