There are 22 boys in a class with an average height of 140.5 cm; there are 18 girls with an average height of 142.1 cm. What is the average height in centimeters of the students in the class?
一个班有22个男生，平均身高140.5厘米；有18个女生，平均身高142.1厘米．全班同学的平均身高是多少厘米？
<gadget id="calculator">140.5 * 22</gadget>
<output>3_091</output>

<gadget id="calculator">142.1 * 18</gadget>
<output>2_557.8</output>

<gadget id="calculator">3_091 + 2_557.8</gadget>
<output>5_648.8</output>

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

<gadget id="calculator">5_648.8 / 40</gadget>
<output>141.22</output>

<result>141.22</result>