To produce a batch of prefab houses. According to the ratio of 5:4 to factory A and factory B, factory A has actually completed 120 sets, which is 80% of the original assignment. How many sets are the tasks for this batch of prefabricated houses?
要生产一批活动板房．按5：4的比分给甲、乙两个工厂，甲厂实际完成了120套，是原分配任务的80%．这批生产活动板房的任务是多少套？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">120 / (4/5) / (5/9)</gadget>
<output>270</output>

<result>270</result>