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OpenStudy (anonymous):
Find the missing number in each group. 1) Average is 30. Find the missing number: 14, 28, .....
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OpenStudy (anonymous):
14+28=7X6=42 So, (42+x)/2=30 42+x=60 x=18
OpenStudy (stacey):
Since the average is of three numbers, that should be (42+x)/3 =30
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