exam Maths Puzzle Numerical Ability

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

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exam Other Question

2x-y=5
3x+y=5
find the point of intersection for the lines below by graping 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?