The construction site has transported 1,600 tons of yellow sand, which has been used for 4 days, with an average of 150 tons per day, and the rest is planned to use 200 tons per day. How many days is enough?
建筑工地运进了1600吨黄沙，已经用了4天，平均每天运150吨，余的计划每天用200吨．还够用多少天？
<gadget id="calculator">150 * 4</gadget>
<output>600</output>

<gadget id="calculator">1_600 - 600</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 / 200</gadget>
<output>5</output>

<result>5</result>