Write a real word problem in which two negative integers are subtracted

Jack and Jill each took a pail of water out of the tank on the hill. When Jack filled his pail, the water in the tank decreased by 6 gallons. When Jill filled her pail, the water in the tank dropped by 4 gallons. Who had more water in the pail ? How much more ? (Jack is terrible at Math. He broke his crown trying to answer this question.)