A hospital staff mixed a 75% disinfectant solution with a 25% disinfectant solution. How many liters of each were used to make 15 L of a 45% disinfectant solution?

Question

A hospital staff mixed a 75% disinfectant solution with a 25% disinfectant solution. How many liters of each were used to make 15 L of a 45% disinfectant solution?

Answer 1

75S+25T=45(15)=675, S+T = 15, multiply that 2nd equation by 25 to get

25S+25T = 375 Now subtract to get

50S = 300

S=300/50 = 6 Liters

T=15-6 = 9 Liters