Deon used 20 quarts of gasoline on a road trip. He wants to know how much gasoline was used in gallons.

To convert quarts to gallons knowing that 4 quarts is equal to 1 gallon, we can create a double number line representing both measurements.

Double Number Line

Quarts:   0       4       8       12      16      20
            |-------|-------|-------|-------|
Gallons:   0       1       2       3       4

Explanation

• Each interval represents 4 quarts.
• At 0 quarts, there are 0 gallons.
• At 4 quarts, there is 1 gallon.
• At 8 quarts, there are 2 gallons.
• At 12 quarts, there are 3 gallons.
• At 16 quarts, there are 4 gallons.
• Finally, at 20 quarts, there are 5 gallons.

Conclusion

When Deon used 20 quarts of gasoline on his road trip, this is equivalent to 5 gallons (20 quarts ÷ 4 quarts per gallon = 5 gallons).