The shirt factory produced 640 shirts in the past 4 days, and now it produces 350 shirts a day. How many more shirts are produced now than in the past?
衬衫厂过去4天生产衬衫640件，现在每天生产350件，现在比过去每天多生产多少件？
<gadget id="calculator">640 / 4</gadget>
<output>160</output>

<gadget id="calculator">350 - 160</gadget>
<output>190</output>

<result>190</result>