exam Maths Puzzle Numerical Ability

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Let f(x)= [x-4] and g (x) = x + 2. Find f o g and g o f

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y=3/4x+1/2 Thank you in advance for your help with this problem. How many liters of 60% acid solution must be added to 14 liters of a 10% acid solution to produce a 25% acid solution?