Question 519471
130 oz of lotion costs  = $3.46 per ounce 
90 oz of lotion  costs  = $11.38 per ounce.
Mixture costs = x per ounce

3.46*130+11.38*90 = (90+130)*x
449.8+1024.2 = 220x
1474=220x
1474/220=220x/220
6.7=x
x=6.7
Mixture costs $6.7 per ounce