Xiaojie read a book in 3 days (2/5), the average number of books he read in 3 days. (fill in a fraction)
小杰3天读了一本书的(2/5)，3天里平均每天读了这本书的多少．(填几分之几)
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 3</gadget>
<output>2/15 = around 0.133333</output>

<result>2/15 = around 0.133333</result>