The monthly electricity consumption of Zhang Huajia in the fourth quarter of last year (October-December) is: 120 degrees in October, 128 degrees in November, and 142 degrees in December. What is the average monthly electricity consumption of Zhang Huajia in the fourth quarter?
张华家去年第四季度(10--12月)每月用电情况分别是：10月份120度，11月份128度，12月份142度．张华家第四季度平均每月用电多少度？
<gadget id="calculator">120 + 128 + 142</gadget>
<output>390</output>

<gadget id="calculator">390 / 3</gadget>
<output>130</output>

<result>130</result>