There are 20 workers in a workshop producing bolts and nuts, and each worker can produce 12 bolts or 16 nuts per hour. If some workers are sent to produce bolts and the rest to produce nuts, so that the bolts and nuts produced per hour can be matched at a ratio of 1:2, how many workers should be sent to produce bolts? (Solution of column equation)
某车间有20名工人生产螺栓和螺母，每人每小时能生产螺栓12个或生产螺母16个．如果派一部分工人生产螺栓，其余工人生产螺母，使得每小时生产出的螺栓和螺母恰好可以按1：2的比例配套，问应该派多少工人生产螺栓？(列方程解)
<gadget id="calculator">320 / 40</gadget>
<output>8</output>

<result>8</result>