The double number line shows that 
\[5\] kilograms of avocados cost 
\[\$9\].
A double number line with 6 equally spaced tick marks. The line labeled Avocados, kilograms, reads from left to right: 0, four unlabeled tick marks, 5. The line labeled Cost, dollars, reads from left to right: 0, four unlabeled tick marks, 9.
\[0\]
\[5\]
\[5\]
\[0\]
\[9\]
\[9\]
Based on the ratio shown in the double number line, what is the cost for 
\[1\] kilogram of avocados?

To find the cost of 1 kilogram of avocados, we need to use the given ratio from the double number line.

The ratio given is:

\[
5 \text{ kilograms} = 9 \text{ dollars}
\]

Now, we want to find the cost for 1 kilogram. To do this, divide both sides of the ratio by 5:

\[
\frac{5 \text{ kilograms}}{5} = \frac{9 \text{ dollars}}{5}
\]

This simplifies to:

\[
1 \text{ kilogram} = \frac{9}{5} \text{ dollars}
\]

Performing the division:

\[
1 \text{ kilogram} = 1.8 \text{ dollars}
\]

Thus, the cost for 1 kilogram of avocados is **\$1.80**.

Would you like further details or have any questions?

Here are some related questions:
1. What would the cost be for 10 kilograms of avocados?
2. How would you find the cost for 2.5 kilograms using the same ratio?
3. What is the unit rate in dollars per kilogram, and why is it important?
4. Can you express the price as a fraction of dollars per kilogram?
5. How does changing the amount of avocados affect the total cost?

**Tip**: When dealing with ratios, always reduce to the unit rate (per 1 unit) to simplify calculations.

Based on the ratio shown in the double number line, what is the cost for 1 kilogram of avocados?

Learn how to find the cost of 1 kilogram of avocados using a ratio from a double number line. The problem involves basic ratio concepts, unit rate calculation, and proportional reasoning. Suitable for students in Grades 6-8.

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