exam Maths Puzzle Numerical Ability

0.4n-18=3n-16-0.8h can you also show me how to check it?

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A hospital staff member mixed a 65% disinfectant solution with a 15% disinfectant solution. How many liters of each were used to make 50 liters of a 37% disinfectant solution? Could someone please help me solve this question: Using the Row Echelon method, solve the following system of three linear equations: x + y + 2 z = 1
and 2 x + y = 2 and x + 2 y +