Question 157946
70*.5=.30X+.80(70-X)
35=.30X+56-.80X
35-56=-.50X
-21-.5X
X=-21/-.5
X=42 LITERS OF THE 30% ALCOHOL IS NEEDED.
70-42=28 LITERS OF THE 50% ALCOHOL IS ALSO NEEDED.
PROOF:
70*.5=.30*42+.80*28
35=12.6+22.4
35=35