How many pounds of hamburger worth $1.05 per pound must be mixed with 60 pounds of hamburger worth $0.90 per pound to produce hamburger worth $1.00 per pound? which of the following systems represents the word problem if x = pounds of hamburger worth $1.05 per pound? x + y = 60 and 1.05x + 0.90(60) = 1.00y x + 60 = y and 1.05x + 1.00y = 0.90(60) x + 60 = y and 1.05x + 0.90(60) = 1.00y