Dad bought some chocolates, and Zhang Hua ate (1/5), which happened to be 4 pieces. How many chocolates did Dad buy?
爸爸买来一些巧克力，张华吃了(1/5)，正好吃了4块．爸爸买来多少块巧克力？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / (1/5)</gadget>
<output>20</output>

<result>20</result>