book Maths Puzzle Numerical Ability

23/35x 5x+1/2x-13b=12bx=5 1/2x x93b=x

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make up a word problem that you can solve using a linear system with solution of(5,35) 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