The label of the medicine box reads: 0.1mg*90 tablets, 3 times a day, 0.2mg each time, how many days can a box of medicine be taken?
药盒的标签上写着：0.1mg*90片，每天吃3次，每次吃0.2mg，一盒药可以吃几天？
<gadget id="calculator">90 * 0.1</gadget>
<output>9</output>

<gadget id="calculator">0.2 * 3</gadget>
<output>0.6</output>

<gadget id="calculator">9 / 0.6</gadget>
<output>15</output>

<result>15</result>