There are 100 ordinary workers and 15 skilled workers in a certain workshop. The ratio of skilled workers to ordinary workers is now required to be 1:4. If none of the ordinary workers is transferred, how many more skilled workers will be hired?
某车间有普通工人100名，技术工人15名，现在要求技术工人与普通工人的人数比是1：4，如果普通工人一个也不调走，那么需要再聘多少名技术工人？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 100</gadget>
<output>25</output>

<gadget id="calculator">25 - 15</gadget>
<output>10</output>

<result>10</result>