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21 June, 10:13

The average of a set of 10 numbers is 6. nine of the numbers are as follows: 3,4,5,6,7,10,1,3,12. what's the tenth number?

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  1. 21 June, 11:32
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    3+4+5+6+7+10+1+3+12 + x = 10*6 = 60

    51 + x = 60

    x = 60-51 = 9

    Answer = 9
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