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.