exam Maths Puzzle Numerical Ability

If the area of a circle is 64 pi, what is its circumference?

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exam Other Question

I need help solving this logarithmic equation

log(x-14)-log5=log(x-12)-logx Another very common mistake is in the equation below:
The equation: 6x - (x + 3) = 5 + 2x
First step in solving: 6x - x + 3 = 5 + 2x
Write a clear explanation of what error has been made and what could be done to
avoid the mistake.