The mean of three numbers is 7 . If the two numbers are 7 and 8 . find the third number .
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Let the third no be x.
So x+7+8/3=7
15+x=21
x=6
So the third no is 6.
So x+7+8/3=7
15+x=21
x=6
So the third no is 6.
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