Xiaofang buys a book and a stamp album. The price of the book is 4 yuan, which is exactly (1/5) of the price of the stamp album. How much is the price of this stamp album?
小芳买一本书和一本集邮册，书的价钱是4元，恰好是集邮册价钱的(1/5)．这本集邮册的价钱是多少元？
<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>