An engineering team wants to drain the water from a pond. If 15 pumps are used to pump water for 8 hours a day, 1260 tons can be discharged in 7 days; How many pumps are needed?
某工程队施工时，欲将一个池塘的水排完，若用15台抽水机，并且每天抽水8小时，则7日可排水1260吨；若每天抽水12小时，要求14天排水7560吨，则应需几台抽水机？
<gadget id="calculator">1_260 / 7 / 8 / 15</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) * 12 * 14</gadget>
<output>252</output>

<gadget id="calculator">7_560 / 252</gadget>
<output>30</output>

<result>30</result>