If a batch of soap is distributed to workers in a certain workshop, each person can get 12 yuan on average. If it is distributed to female workers, each person can get 20 yuan on average. If it is only distributed to male workers, how many yuan can each person get on average.
把一批肥皂分发给某车间工人，平均每人可分到12块，若分给女工，平均每人可分到20块，若只分给男工，平均每人可分到多少块．
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/12) - (1/20)</gadget>
<output>1/30 = around 0.033333</output>

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

<result>30</result>