exam Maths Puzzle Numerical Ability

Lucy has invested some money invested at 18% and three times as much invested at 12%. her total annual income from the 2 investment is 85,000 pesos. how much was invested at each rate?

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Bob's Bank holds a simple discount note in the amount of $8,000. The discount rate was 9% and the term of the note was 150 days. The bank rediscounted the note after 90 days at 7%. solve the rational enequality and graph the solution set on a real number line. express the solution set in interval notation.

x-9/x+1>0