exam Maths Puzzle Numerical Ability

using logarithms solve index is 5, radical sign over 125/0.55

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exam Other Question

A worker can finish a job in 18 days.An other worker can do the same work but in 24 days and an other worker can do the same work in 30 days . If the 3 workers work 6 days together,what part of the job will be done ?? how do you do work out graphing equations and inequalities?