exam Maths Puzzle Numerical Ability

If f(x)=5x-1 find the following:

f(a-2)

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The length of a rectangle is 3m more than 5 times the width.The perimeter is 126m find the length and width. My question is: Suppose that you have a supply of a 30%solution of alcohol
and 70% of solution of alcohol. how many quartz of each should be mixed to poduce 20 quartz that is 40%alcohol?