If 2 skilled workers and 4 novices can complete a batch of parts in one day (3/10), 8 skilled workers and 10 novices can complete this batch of parts in one day. If all these parts are finished by a novice in one day, how many novice should be required.
如果2个熟练工和4个新手一天可做完一批零件的(3/10)，8个熟练工和10个新手一天就能把这批零件做完．若这批零件全部由新手一天做完，则应要新手多少个．
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) * 4</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(6/5) - 1</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">16 - 10</gadget>
<output>6</output>

<gadget id="calculator">(1/5) / 6</gadget>
<output>1/30 = around 0.033333</output>

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

<result>30</result>