In What proportion must flour at $0.8 per pound be mixed with flour at $0.9 per pound so that the mixture costs $0.815 per pound? Select the correct option.
A) 1:3	B) 1:2	C) 6:1	D) 2:1	E) 3:1
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) = 0.815   0.9 – 0.1x = 0.815   x = 0.85   Thus ratio of both flours is 6:1   6:1
<result>C</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 $0.815 per pound?