A piece of cloth is (4/5) meters long, and (3/8) of it is used up, how many meters are used up?
一块布长(4/5)米，用去了它的(3/8)，用去了多少米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(4/5) * (3/8)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>