According to 3:37, Uncle Wang mixed the liquid medicine and water together to make a spray. If there are 160 kilograms of spray in total, how many kilograms of the liquid medicine was used.
王伯伯按3：37把药液和水兑在一起制成了喷洒剂，如果共有喷洒剂160千克，那么，使用了药液多少千克．
<gadget id="calculator">3 + 37</gadget>
<output>40</output>

<gadget id="calculator">3 / 40</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">160 * (3/40)</gadget>
<output>12</output>

<result>12</result>