There is a pile of sand, which is transported to the construction site by a large truck, and 2437 tons are transported every day. It takes 4 days to transport this pile of sand. If it is transported by tractor, 1567 tons have been transported, how many tons are left to be transported?
有一堆沙，用大卡车运到工地，每天运2437吨，需运4天才能把这堆沙运完．如果用拖拉机运，已运了1567吨，还剩多少吨没运？
<gadget id="calculator">2_437 * 4</gadget>
<output>9_748</output>

<gadget id="calculator">9_748 - 1_567</gadget>
<output>8_181</output>

<result>8_181</result>