SOLUTION: How many pounds of chicken feed that is 30% corn must be mixed with 280 lb of a feed that is 80% corn to make a chicken feed that is 70% corn?

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Question 363212: How many pounds of chicken feed that is 30% corn must be mixed with 280 lb of a feed that is 80% corn to make a chicken feed that is 70% corn?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.30x+.80*280=.70(280+x)
.30x+224=196+.70x
.30x-.70x=196-224
-.40x=-28
x=-28/-.40
x=70 pounds of 30% feed is used.
Proof:
.30*70+.80*280=.70(280+70)
21+224=.70*350
245=245