book Maths Puzzle Numerical Ability

ln7 + 1/2ln9

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Mick sells 495 hamburgers. If he sold have as many with cheese as without, how many of each kind did he sell? how do u solve 3x+y=-11;y=14/5x-63/5;x=-14+2y;x-3y-27;y=7/12x+241/12