60 milliliters of ink is used (2/3), how many milliliters are used.
60毫升的墨水，用去(2/3)，用去多少毫升．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">60 * (2/3)</gadget>
<output>40</output>

<result>40</result>