book Maths Puzzle Numerical Ability

3a=5a+22

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solve the Quadratic equation(2x2 is Two x squared)2x2+x-6=0 graphically the time it takes to complete a certain job varies inversely to the number of people working on that job. If it takes 36 hrs for 7 carpenters to frame a house, how long will it take 54 carpenters to do the same job?