Two classes

The average of 1A class of 25 is 12 years and the average age of 1B class of 22 is 10 years. What is the average age of the pupils of 1A and 1B classes?

Correct answer:

x =  11.0638

Step-by-step explanation:

n1=25 m1=12  n2=22 m2=10  x=n1+n2n1 m1+n2 m2=25+2225 12+22 10=11.0638

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