exam Maths Puzzle Numerical Ability

please help me

y^2 /y-4 - 4/y-4


y^3-5y /6y - y^3+y+3/6y

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exam Other Question

logn1/8=-3

n=log81/6

log1/8n=4/3

log2n=-3

log1/9^27=n
a number u times 5