book Maths Puzzle Numerical Ability

Solve by using quadratice formula: 3x^2=11x+4

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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? the sum of the digits of a 2 digit number is 9. if the number is doubled than decreased by by 36, the answer is the original number with the digits reversed. Find the number. You m