What is the solution to the system of equations?

x + y + z = 18

z = 2y

5x + 2y + 6z = 85

2÷6+1/2 to the second power plus one

Beth makes batches of bluberry muffins and banna muffins. each batchis 6 muffins. she makes 2.5 batches of bluberry muffins. how many batches of bananna muffins should beth make if she wants to have a total of 60 muffins?

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?