Math
posted by Brittany .
Calculate the percentage strength of hydrocortisone if you combine 30 g of 1%, 45 g of 0.5%, and 15 g of 2%. Round to the hundredth.

you know, all these mixture problems are done the same way.
If you have x ml of p% solution and y ml of q%, making z ml of r% solution,
px + qy = rz
Naturally, z = x+y
Now, plug in your numbers and show us whatcha got. By now you've been through all the variations. If you want confirmation, show us your solution. If you get stuck, show us where. Otherwise, . . .