How to get 6

Colette and Boris both consume the same goods in a pure exchange economy. Colette is originally endowed with 9 units of good 1 and 6 units of good 2. Boris is originally endowed with 18 units of good 1 and 3 units of good 2. They both have the utility function U(x1, X2)= x11/3x22/3. If we let good 1 be the numeraire, so that p1 = 1, then what will be the equilibrium price of good 2? Oa. 1 O b. 12 O c. 3 O d. 6 Your answer is incorrect. The correct answer is: 6