exam Maths Puzzle Numerical Ability

determine whether the graph of y=/4x/ is

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exam Other Question

There are 20 kilograms of a solution that is 10% salt. How many kilograms of salt must be added to make a solution that is 25% salt? Could someone please help me multiply and then reduce
x^2+x-6/2x * 2x^2-4x/x^2+7x+12

Thanks so much for your help in advance