A pharmacy is to prepare 500ML of D8W. The pharmacy stocks SWFI, D5W and D10W. hOW MUCH OF THESE INGREDIENTS

should be used to make the solution?

Let x = the amount of D5W. (5)
Then 500-x will be the amount of D10W (10)

Find amount of D5W
x(5) + (500 - x)(10) = 500 (8)

5x + 5000 - 10x = 4000

1000 = 5x

x = 200
200ml of D5W

Find amount of D10W
500 - x
500 - 200
=300
300ml of D10W




06162012