There is a pile of coal in a factory (4/5) tons, and (2/3) is used. How many tons were used?
某工厂有一堆煤共(4/5)吨，用去(2/3)．用去了多少吨？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(4/5) * (2/3)</gadget>
<output>8/15 = around 0.533333</output>

<result>8/15 = around 0.533333</result>