book Maths Puzzle Numerical Ability

My problem is solve the equation for the variable A. As well as show how to get to that solution.

(A+B)/C=D

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i need help with this problem: the number of persons needed to do a job varies directly as the amount of work to be done and inversly as the time in which the job is to be done. If Graph the following equation, label any intercepts. y = ln(x - 1) + 2