Bottle A and Bottle B contain a mixture of gooseberry juice and mooseberry juice (and nothing else). The ratio of gooseberry juice to mooseberry juice in Bottle A is 2:3. The ratio of gooseberry juice to mooseberry juice in Bottle B is 7:3. When the two bottles are combined, the ratio of gooseberry juice to mooseberry juice is 3:4. If Bottle A had 45 ounces of juice, how many ounces of juice did Bottle B have? Write your answer as a simplified fraction.