The sum of the numbers A and B is 36, and the number A is 80% of the number B. What is the number A?
甲乙两数的和是36，其中甲数是乙数的80%，甲数是多少
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">36 / (9/5)</gadget>
<output>20</output>

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

<result>16</result>