In What proportion must flour at $0.8 per pound be mixed with flour at $0.9 per pound so that the mixture costs $0.845 per pound?  Choose the correct answer:
A) 1:3  B) 1:2  C) 1:1  D) 2:1  E) 5:4
Using weighted average method:   Let x be the proportion in which the $0.8 per pound flour is mixed with $0.9 per pound flour.   Thus 0.8*x + 0.9*(1-x) = 0.845   0.9 – 0.1x = 0.845   x = 0.55   Thus ratio of both flours is 5:4   5:4
<result>E</result>
In What proportion must flour at $0.8 per pound be mixed with flour at $0.9 per pound so that the mixture costs $0.845 per pound?