Question 613657
let x = liters of 5%, and y = liters of 19%


x + y = 560 ___ 5x + 5y = 5 * 560


(5%)x + (19%)y = (8%)560 ___ 5x + 19y = 8 * 560


subtracting equations (to eliminate x) ___ 14y = 3 * 560 ___ y = 3 * 40


solve for y, then substitute back to find x