book Maths Puzzle Numerical Ability

find z if 3z-19=173-wang

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I'm not sure how to get 3 over 5-the square root of 2
Could you help me? thanks! A piece of wood burns completely in one second at 600 degress C. the time the wood takes to burn is doubled for every 10 degrees C drop in the temperature and halved for every 10 d