A batch of "Elementary School Teaching" magazines were packaged and sent to the post office. Each pack contained the same number of volumes. (3/5) of this batch of magazines was enough to pack 5 packs, and there were 42 more volumes, and the remaining 208 volumes. How many volumes are there?
一批《小学教学》杂志打包后送往邮局，每包所装册数相同，这批杂志的(3/5)够打5包，还多42册，剩下的还有208册，平均每包多少册？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">208 / (2/5)</gadget>
<output>520</output>

<gadget id="calculator">520 * (3/5)</gadget>
<output>312</output>

<gadget id="calculator">312 - 42</gadget>
<output>270</output>

<gadget id="calculator">270 / 5</gadget>
<output>54</output>

<result>54</result>