exam Maths Puzzle Numerical Ability

Ho do you simplify a radical that is a fraction????

EXAMPLE: the square root of 1/5

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exam Other Question

Solve these simultaneous equations:

2log(2)y = log(4)3 + log(2)x

3^y = 9^x

given that x and y are positive

I have no idea how to even begin to solve this 1/2r=-1/2r+3/8