Class 51 has 18 boys with an average height of 142.5 cm, and 22 girls with an average height of 140.5 cm. What is the average height of the class in cm?
五1班有男生18人，平均身高142.5厘米，有女生22人，平均身高140.5厘米，全班同学平均身高是多少厘米？
<gadget id="calculator">142.5 * 18</gadget>
<output>2_565</output>

<gadget id="calculator">140.5 * 22</gadget>
<output>3_091</output>

<gadget id="calculator">2_565 + 3_091</gadget>
<output>5_656</output>

<gadget id="calculator">18 + 22</gadget>
<output>40</output>

<gadget id="calculator">5_656 / 40</gadget>
<output>707/5 = around 141.4</output>

<result>707/5 = around 141.4</result>