The construction site transported 4 tons of cement for the first time, and 3000 kg for the second time, how many tons of cement were transported in total for the two times.
建筑工地第一次运进水泥4吨，第二次又运进3000千克，两次共运进多少吨水泥．
<gadget id="calculator">3_000 / 1_000</gadget>
<output>3</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<result>7</result>