exam Maths Puzzle Numerical Ability

a coat went on sale for 40% it sold fpr 270.00 what was the original cost of the coat

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Prove identity

cot x-1/1-tan x=csc x/sec x
A car radiator has a 6 liter capacity. If the liquid in the radiator is 40% antifreeze, how much liquid must be replaced with pure antifreeze to bring the mixture up to a 50% solu