If (3/5) of a piece of land is 18 hectares, how many hectares is (7/10) of this piece of land?
一块地的(3/5)是18公顷，则这块地的(7/10)是多少公顷．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">18 / (3/5)</gadget>
<output>30</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">30 * (7/10)</gadget>
<output>21</output>

<result>21</result>