exam Maths Puzzle Numerical Ability

simplify the complex fraction

9^2-16^2y over xy all over 3 over x -4 over x

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need help
find the third term in the expansion of (3t+4)^8 A Radiator has 10L of 30% Fluid (30% Anti Freeze and 70% Water). How many liters need to be replaced to have a 50% solution?