Xiaoli's family has 38 chickens, 15 of which are roosters. If each hen lays 27 eggs a month, how many eggs will these chickens lay in total?
小丽家养了38只鸡，其中有15只是公鸡，如果每只母鸡一个月下蛋27只，那么这些鸡一个月一共下多少个蛋？
<gadget id="calculator">38 - 15</gadget>
<output>23</output>

<gadget id="calculator">23 * 27</gadget>
<output>621</output>

<result>621</result>