## Elementary Algebra

We call w the cost of a sweater, b the cost of a blouse, and k the cost of a skirt. Thus, we know: $k + w = 6b + 2 \\ k = 2(b + w) \\ k + b + w = 72$ First, using equations two and three, we substitute k/2 for b+w: $k + k/2 = 72 \\ k = 48$ This means: $24 = b+ w \\ w = 24 -b$ We plug this into equation one to find: $48 + 24 - b = 6b +2 \\ 7b = 70 \\ b = 10$ Thus: $w = 24 - b = 24 - 10 = 14$