There are (2/5) liters in a box of milk, which just fills 3 large cups. How many liters of milk are there on average?
一盒牛奶有(2/5)升，正好倒满3大杯．平均每杯牛奶有多少升？
<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>