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If the average of 8,9,11,2 x is 10 , x -...

If the average of `8,9,11,2 x` is 10 , `x - ….............

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Average `=8+9+11+2 x/4=10`
`rarr 28+2 x=40 rarr 2 x=40-28`
`rarr x=40-28/2=6`
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