18. a science teacher has a supply of 20% saline solution and a supply of 50% saline solution. how much of each solution should the teacher mix together to get 60 ml of 28% saline solution for an experiment? (1 point)
a) 16 ml of the 20% solution and 44 ml of the 50% solution
b) 44 ml of the 20% solution and 16 ml of the 50% solution
c) 16 ml of the 20% solution and 16 ml of the 50% solution
d) 44 ml of the 20% solution and 44 ml of the 50% solution