There are 56 washing machines in the warehouse, and a truck delivers 4 at a time, twice a day. How many days can these washing machines be delivered?
库房里有56台洗衣机，一辆货车一次送4台，每天送2次，这些洗衣机多少天能够送完？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">56 / 8</gadget>
<output>7</output>

<result>7</result>