exam Maths Puzzle Numerical Ability

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?

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the sum of the digits of a three-digit number is 15. if the tens digits and the hundreds digit are interchanged. the number is increased by 360. if the units digits is 1/4 of the s 0.4n-18=3n-16-0.8h can you also show me how to check it?