The construction site brought 350 bags of cement, each weighing 25 kilograms. After some of the bags were used, there were 150 bags left. How many kilograms of cement were used?
建筑工地运来350袋水泥，每袋重25千克，用去一些后还剩150袋，用去水泥多少千克？
<gadget id="calculator">350 * 25</gadget>
<output>8_750</output>

<gadget id="calculator">150 * 25</gadget>
<output>3_750</output>

<gadget id="calculator">8_750 - 3_750</gadget>
<output>5_000</output>

<result>5_000</result>