Layla is shipping cans of soup and boxes of pasta to a local food pantry. Each can of soup weighs 18.6 ounces and each box of pasta weighs 16 ounces. The maximum weight of the shipping box Layla will use to ship the food is 40 pounds. If Layla plans to put 15 cans of soup in the shipping box, how many boxes of pasta can she put in the same shipping box without going over the maximum weight?