exam Maths Puzzle Numerical Ability

A car that sold for $15,200 had a sales tax of $912. At the same rate, how much is the tax on a car that sells for $12,000?

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A Chemist ahs 25% and a 50% acid soultion. How much of each soultion should be used to form 200 ml of a 35% acid soultion. Suppose f(x)=3x^2-4x+5. Explain how f(9) differs from f(x)=9.