Acontractor mixes concrete from bags of pre-mix for small jobs. how many bags with 9% cement should he mix with 8 bags of 16.5% cement to produce a mix containing 12% cement?

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Iplay an instrument and i'm in band

Figure it out your self

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,