Teacher Wang went to the grocery store to buy candies on June 1st. The money Mr. Wang brought happened to be able to buy only 20 kilograms of chocolate candy, or only 30 kilograms of butterscotch. Teacher Wang decides to buy 8 kilograms of chocolate candies, and the rest of the money to buy butterscotch, so how many kilograms of butterscotch can you buy?
六一节王老师到食品店去买糖果．王老师带的钱正好只能买20千克巧克力糖，或者只能买30千克奶油糖．王老师决定买8千克巧克力糖，余下的钱买奶油糖，那么能买多少千克奶油糖？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 8</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(3/5) / (1/30)</gadget>
<output>18</output>

<result>18</result>