A 70% solution and 20% solution are combined to make a 30% solution. What is the ratio

Question

pharmacy math

Answer 1

I assume that the question is asking about the ratios of the volumes.

Let A and B be the volumes, and consider 1 liter of the mixture.

The concentrations are 0.7 and 0.2

The equations to solve are

0.7A +0.2B = 0.3(1)

and A + B = 1

 

Solve for A and B, and find the ratio A/B.