Xiao Ming has 50 yuan, the total money is used to buy books (3/5), and the book is used to buy sporting goods (2/5). How much did you spend buying sporting goods?
小明有50元，买书用去总钱数的(3/5)，买体育用品用去的是买书的(2/5)．买体育用品用去了多少元？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">50 * (3/5) * (2/5)</gadget>
<output>12</output>

<result>12</result>