124. 114. ‘A’ can do a piece of work in 7 days of 9 hours each and 'B' can do it in 6 days of 7 hours each. How long will they take to do it, working together 8 hours a day? (a) 3 days (b) 6 days (c) 9 days (d) 12 days

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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,