The Stevens family contains three adults and five children. The Muster family contains two adults and four children. On a typical day on the trail, the Stevenses use about 15 gallons of water for drinking, washing, and so on. The Musters use about 11 gallons of water per day. Assume each adult uses about the same amount of water. Also assume each child uses about the same amount. How much water does each adult and each child use on a typical day?