SOLUTION: susan wants to mix 10 pounds of virginia peanuts that costs $3.50 a pound with spanish peanuts that cost $3.00 a pound to obtain a mixture that costs $3.40 a pound. how many pounds

Question 543533: susan wants to mix 10 pounds of virginia peanuts that costs $3.50 a pound with spanish peanuts that cost $3.00 a pound to obtain a mixture that costs $3.40 a pound. how many pounds of spanish peanuts should she use?
Found 2 solutions by josmiceli, richwmiller:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = pounds of Spanish peanuts needed
In words:
( total cost of mixture ) / ( total pounds of mixture ) = $3.40
given:
= total pounds of mixture
= cost of Virginia peanuts used
= cost of Spanish peanuts used
--------------

She needs 2.5 pounds of Spanish peanuts
check answer:

OK
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
3.5*10+3p=3.4*(10+p)
p=2.5
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