Shirley has two containers of water for a camping trip. One container holds 2 times as much as the other. The total amount of water is 30 gallons. How much water is in each container?

**x = amount in one container**

**2x = amount in other container**{one container holds 2 times as much as the other}

x + 2x = 30 {the total amount of water is 30 gallons}

3x = 30 {combined like terms}

x = 10 {divided each side by 3}

2x = 20 {substituted 10, in for x, into 2x}

one container holds

**10 gallons**

the other container holds

**20 gallons**

*- Algebra House*