book Maths Puzzle Numerical Ability

well my problem is...i dont even know where to start when doing these word problems...im easily confused when it comes to these types of problems...what can i do?

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book Other Question

I'M at a loss, please help! I don't think i'm doing it right and need to know how to get the right answer. the problem is:

To Earn a B ina course, you must have a final average Solve by using quadratice formula: 3x^2=11x+4