Question 167914
5.80x+5.00(20-x)=5.50*20
5.80x+100-5x=110
.80x=110-100
.80x=10
x=10/.80
x=12.5 kg. of $8.50  nuts are used.
20-12.5=7.5 kg. of $5 nuts are used.
proof:
5.80*12.5+5*7.5=5.50*20
72.5+37.5=110
110=110