A school bought a total of 40 tons of coal, 10 tons have already been shipped, and the remaining 5 tons are shipped every day. How many days will it take to get all of them?
一所学校共买煤40吨，已经运来10吨，剩下的每天运5吨，还要几天才能全部运到？
<gadget id="calculator">40 - 10</gadget>
<output>30</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<result>6</result>