For this reaction, the mass of carbon dioxide and glucose involved are the product of thier molar mass and the number of moles of each compound involved in the reaction.
carbon dioxide: 6 x (12 + 2 x 16) = 264
glucose : 1 x (6 x 12 + 12 + 6 x 16) = 180
Divide their masses to get the equivalent weights. The answer is 22/15 or 11/7.5.