A box of toothpaste is 60% cheaper than a bottle of shampoo. A bottle of shampoo costs 20 yuan. How much does a box of toothpaste cost?
一盒牙膏比一瓶洗发水便宜60%，一瓶洗发水售价20元，一盒牙膏售价多少元？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * (2/5)</gadget>
<output>8</output>

<result>8</result>