exam Maths Puzzle Numerical Ability

Can the square root of 1/64^3 be evaluated? If so, please show me how

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exam Other Question

2r+-7=1r--5

I am not sure if the negative 5 will become a positive because of the subtration in front of it. this how I would do the question
2r-1r+-7+7=1r-1r--5+7
r=12
140/3+2x/3