Answer:
Explanation:
To solve this problem using a double line diagram, we can start by drawing two parallel lines representing the two quantities in the ratio:
Gasoline: |----------------------|
Oil: |-----------------|
We know that the ratio of gasoline to oil is 1 gallon to 2.6 ounces. We can use this ratio to divide the lines into equal parts. Since 1 gallon equals 128 ounces, we can divide the gasoline line into 128 equal parts, each representing 1 ounce. Then, we can divide the oil line into 2.6 equal parts, each representing 2.6 ounces.
Gasoline: |--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|
Oil: |-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
Now, we can use the diagram to find out how many ounces of oil are needed when the landscaper uses four gallons of gasoline. To do this, we can simply count the number of parts on the oil line that correspond to four gallons on the gasoline line:
Gasoline: |--------|--------|--------|--------|
Oil: |-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
From the diagram, we can see that 4 gallons of gasoline correspond to 104 parts on the gasoline line. Therefore, the landscaper needs:
104 parts × 2.6 ounces per part = 270.4 ounces of oil
So, the landscaper needs 270.4 ounces of oil when using four gallons of gasoline at a ratio of 1 gallon to 2.6 ounces of oil.