if the average of 7 numbers is 5 and 5 numbers is 7 then what is the average of 12 numbers
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average=(sum of data)/no of data
sum of numbers= average× no of numbers
sum of 7 numbers= 5×7=35
sum of 5 numbers=7×5=35
total sum of numbers=35+35=70
total no of numbers=7+5=12
average of 12 numbers= 70/12=35/6
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