Question 182937
let x="kg of toffee", so 2x="kg of caramels" and 1-3x="kg of mints"


x(3.20) + 2x(3.00) + (1-3x)(2.20) = 2.72


expanding __ 3.2x + 6x + 2.2 - 6.6x = 2.72


subtracting 2.2 and combining terms __ 2.6x = .52


dividing by 2.6 __ x = .2


substituting __ 1-3(.2) = .4 __ this is the kg of mints in one package


so they will need .4(10000) or 4000kg of mints in total