The decoration workers laid the floor for a house. On the first day, they paved the floor of this house (3/8), which was exactly 21 square meters. On the second day, they paved the floor of this house (4/7). How many square meters?
装修工人给一间房子铺地板，第一天铺了这间房子的(3/8)，正好是21平方米，第二天铺了这间房子的(4/7)，第二天铺了多少平方米？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">21 / (3/8)</gadget>
<output>56</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">56 * (4/7)</gadget>
<output>32</output>

<result>32</result>