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?

A 27 cases.

explanation

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