If 2 harvesters can harvest 450 acres of wheat in 3 days, how many days will it take to harvest 2100 acres of wheat with 7 harvesters?
若2台收割机3天可以收割小麦450亩，则用7台收割机收割2100亩小麦需要多少天．
<gadget id="calculator">450 / 3 / 2</gadget>
<output>75</output>

<gadget id="calculator">75 * 7</gadget>
<output>525</output>

<gadget id="calculator">2_100 / 525</gadget>
<output>4</output>

<result>4</result>