The factory shipped 1.08 tons of raw materials, and it was planned to take 4.5 days to save 0.06 tons of raw materials per day. How many days can these raw materials actually be used for?
工厂运来1.08吨原料，计划用4.5天，实际每天节约原料0.06吨，这些原料实际可以用多少天？
<gadget id="calculator">1.08 / 4.5</gadget>
<output>0.24</output>

<gadget id="calculator">0.24 - 0.06</gadget>
<output>0.18</output>

<gadget id="calculator">1.08 / 0.18</gadget>
<output>6</output>

<result>6</result>