exam Maths Puzzle Numerical Ability

Graph, on the number line, all points for which

[x+5] > 4

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exam Other Question

A worker can do a work in 18 days . An oher worker can do the same work but in 24 days ,and another in 30 days . If the 3 workers work 6 days altogether what part of the work will be done ? How would I solve this for kj?:

ln(kj/15) = 2ln(kj/60)

The answer is kj = 240, but I am unsure as to how to get there. Thanks for your help.