In a crazy scenario, the Oylan Vinegar Company has 10,000 gallons of vinegar with 0.622% concentration. This vinegar solution cannot be sold because it's too weak, but the plant manager can't bear to discard it. OVC also has a large batch of vinegar that is 9.50% acetic acid by mass. Calculate how many gallons of the strong vinegar would need to be added to the 10,000 gallons of weak vinegar to obtain a solution that is the appropriate 5.10& acetic acid, by mass.