Hongda Company shipped a batch of aluminum alloy strips, and each billboard needs to use 20m of aluminum alloy strips. These materials can weld 30 billboards in total. If each billboard uses 25m of aluminum alloy strips, how many billboards can be welded with these materials?
宏达公司运来一批铝合金条，每个广告牌要用铝合金条20m，这些材料一共可以焊接30个广告牌．如果每个广告牌用铝合金条25m，这些材料一共可以焊接多少个广告牌？
<gadget id="calculator">30 / 25</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">20 * (6/5)</gadget>
<output>24</output>

<result>24</result>