Problema Solution
D'Andre wants 14L of fruit punch that is 10% juice. At the store, he finds only punch that is 15% juice or punch that is 8% juice. How much of each should he purchase?
Answer provided by our tutors
x+y=14 ------- (1)
(15/100)x + (8/100)y= (10/100)14
15x+8y=140 ---------(2)
mutiply equation (1) by -8
-8x-8y= -112 -----(3)
add, (3) and (2):
7x= 28
x= 28/7= 4 lit
put this in equation (1): 4+y=14
so, y=10 lit.
so, 4 lits of 15% and 10 lits of 8%.