exam Maths Puzzle Numerical Ability

c.

is this correct

simplify: √80 minus √5

my answer: 3√5

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exam Other Question

Can somebody help me?

x+s/xs^2 + 6x+3/x^2s

Thanks. If you replace the equal sign of an equation and put an inequality sign in its place, is there ever a time when the same value will be a solution to both the equation and inequality? If so, can you give an example?