Xiaohong's family bought a 30-meter rope, but actually only used (2/3) of it. How many meters are left?
小红家买了一根30米的绳子，实际只用了它的(2/3)，还剩多少米？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<result>10</result>