The winery sold 81 cases of wine this week. If twice as many red cases were sold than white, how many white cases were sold this week?

Let's represent the number of cases of white wine as w. There are twice as many cases of red wine than white, so red wine = 2w. The total number of cases is 81, so w + 2w = 81. Solve for w: w + 2w = 81 3w = 81 w = 27 cases