A box of juice has (6/15) liters, and a cup can hold (1/5) liters, how many cups can it hold.
一盒果汁有(6/15)升，一个杯子可装(1/5)升，可装多少杯杯．
<gadget id="calculator">6 / 15</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/5) / (1/5)</gadget>
<output>2</output>

<result>2</result>