A real estate development company sold 15 new houses in January this year, 25 new houses in February, 20 new houses in March, 16 new houses in April, and 50 new houses in May and June ． How many new houses were sold each month on average in the past six months?
一个房地产开发公司，今年上半年1月份卖出15套新房，2月份卖出25套新房，3月份卖出20套新房，4月份卖出16套新房，5、6月份共卖出50套新房．这半年中平均每个月卖出多少套新房？
<gadget id="calculator">15 + 25 + 20 + 16 + 50</gadget>
<output>126</output>

<gadget id="calculator">126 / 6</gadget>
<output>21</output>

<result>21</result>