There are several cars loaded with a batch of cement. If each car loads 3.5 tons, 2 tons of this batch of cement cannot be transported. If each car loads 4 tons, after this batch of cement is loaded, another 1 ton can be loaded. How many tons of these cements are there?
有若干辆汽车装一批水泥，如果每辆车装3.5吨，这批水泥就有2吨不能走，如果每辆车装4吨，装完这批水泥后，还可以再装1吨．这些水泥共有多少吨？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">4 - 3.5</gadget>
<output>0.5</output>

<gadget id="calculator">3 / 0.5</gadget>
<output>6</output>

<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<gadget id="calculator">24 - 1</gadget>
<output>23</output>

<result>23</result>