The construction site needs to transport 45 tons of cement, 40% of the total in the first 2 days. According to this calculation, how many days can the remaining days be shipped?
工地要运进45吨水泥，前2天运进总数的40%．照这样计算剩下的再运多少天可以运完？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<result>3</result>