"Children's books" in the bookstore are sold at a 40% discount. Xiao Ming bought a book of fairy tales for 15 yuan. What is the original price of this book?
书店"儿童读物"一律六折出售，小明用15元买了一本童话，这本书原价是多少元．
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">15 / (3/5)</gadget>
<output>25</output>

<result>25</result>