A construction site needs 50 tons of sand, which is transported 5 times by a vehicle with a load of 0.5 tons, and the rest is transported by a vehicle with a load of 2.5 tons. How many times should it be transported?
某工地需要沙50吨，用一辆载重0.5吨的汽车运了5次，余下的改用一辆重2.5吨的汽车来运，还要运多少次？
<gadget id="calculator">0.5 * 5</gadget>
<output>2.5</output>

<gadget id="calculator">50 - 2.5</gadget>
<output>47.5</output>

<gadget id="calculator">47.5 / 2.5</gadget>
<output>19</output>

<result>19</result>