Master Wang produces a batch of parts. If 320 parts are produced every day, it will be completed in 15 days. If it is to be completed in 12 days, how many should be produced per day?
王师傅生产一批零件，如果每天生产320个，15天完成．如果要想12天完成，每天要生产多少个？
<gadget id="calculator">15 / 12</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">320 * (5/4)</gadget>
<output>400</output>

<result>400</result>