The ratio of boys and girls in Class 5 1 is 5:4. The average weight of boys is 41 kg and the average weight of girls is 38.75 kg. What is the average weight of the whole class in Class 5 1?
五1班男、女生人数比是5：4，男生的平均体重为41千克，女生的平均体重为38.75千克，五1班全班的平均体重是多少千克．
<gadget id="calculator">41 * 5</gadget>
<output>205</output>

<gadget id="calculator">38.75 * 4</gadget>
<output>155</output>

<gadget id="calculator">205 + 155</gadget>
<output>360</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">360 / 9</gadget>
<output>40</output>

<result>40</result>