A factory organizes 400-450 employees to participate in tree planting activities, with an average of 32 trees planted per person, including 48 trees per male worker and 13 trees per female worker, so how many male workers participated in tree planting?
某工厂组织400-450名职工参加植树活动，平均每人种树32棵，其中男职工每人种48棵，女职工每人种13棵，那么参加植树的男职工有多少人．
<gadget id="calculator">19 + 16</gadget>
<output>35</output>

<gadget id="calculator">420 / 35</gadget>
<output>12</output>

<gadget id="calculator">12 * 19</gadget>
<output>228</output>

<result>228</result>