book Maths Puzzle Numerical Ability

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

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book Other Question

Find the three concecutive even integers for which 3 times the largest is twice the sum of the two smallest integers. This question has me stumped, would someone help me figure it out? when you have an equation like 1/4x+5=28, and you have to find x, how do you get rid of the fraction?