The original cement on the construction site was 45.5 tons, but 12.95 tons were used today, and another 4.35 tons were shipped in. How many tons of cement are there now?
建筑工地原有水泥45.5t，今天用去12.95t，又运来了4.35t，现在还有多少吨水泥？
<gadget id="calculator">45.5 - 12.95</gadget>
<output>32.55</output>

<gadget id="calculator">32.55 + 4.35</gadget>
<output>36.9</output>

<result>36.9</result>