# Ratio and proportion math

by J. Doe

(N. Carolina)

On Free practice **test #4, Question #8** - I need help with this question:

Two solutions are combined in a 3:1 ratio to make a custom compounded solution. How many of each is required to make 200mL of this mixture?

A. 125mL : 75mL

B. 210mL : 90mL

C. 120mL : 80mL

D. 150mL : 50mL

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