Question 363212
.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