Average weight of 12 students in a class is 30kg. Two boys leave the class and two boys whose average weight is 25kg join the class. If the new average of the class is 305 6kg, what is the average (in kg) of the two boys who left the class ?
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Answer:
3kg
Step-by-step explanation:
12-2=10
10÷30=3
weight of 2 boys left class is 3kg
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36 Kg . 12-2 =10
30÷10=3
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