exam Maths Puzzle Numerical Ability

1/3(s-2)=s+4

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exam Other Question

not sure if in right category
but when the question is like jill does this in 30 min
bob does it in 45
sue takes an hour and a half
how long does it take all of them to do it together
i have no idea how to solve this problem is the suare root of x^2 = x an identity (true for all values of x) explain?