How much is (2/5) of 6 kilometers in 4 kilometers?
6千米的(2/5)是4千米的多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 4</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">6 * (1/10)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>