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Let's go over the problem you provided.

### Part (a):
Omar uses a **ratio of 2 blueberries to 10 strawberries**.

1. **Unit Rate 1:**
   To express the unit rate in terms of blueberries per strawberry, we can divide the number of blueberries by the number of strawberries.
   \[
   \frac{2}{10} = \frac{1}{5}
   \]
   This gives us **1 blueberry for every 5 strawberries**.

2. **Unit Rate 2:**
   Now let's express the unit rate in terms of strawberries per blueberry. We do the inverse:
   \[
   \frac{10}{2} = 5
   \]
   This gives us **5 strawberries for every 1 blueberry**.

So, the two unit rates are:
- **1 blueberry for each 5 strawberries**.
- **5 strawberries for each 1 blueberry**.

### Part (b):
Here, you are asked to find how many blueberries are needed if there are 15 strawberries.

We know the ratio is 2 blueberries for every 10 strawberries. This simplifies to **1 blueberry per 5 strawberries**. Now, if there are 15 strawberries, we can calculate the number of blueberries needed:
\[
\frac{15 \, \text{strawberries}}{5 \, \text{strawberries per blueberry}} = 3 \, \text{blueberries}
\]

Thus, **3 blueberries** are needed for 15 strawberries.

---

Do you want any more details or have any questions about this? 

Here are five related questions you can explore:
1. How would the unit rate change if the ratio were 3 blueberries to 15 strawberries?
2. What if Omar uses 30 strawberries? How many blueberries would be needed?
3. If the ratio changes to 4 blueberries for every 8 strawberries, what are the new unit rates?
4. How can you use the concept of proportions to solve similar problems?
5. How can this blueberry-to-strawberry ratio be represented on a graph?

**Tip**: Unit rates are great for comparing different quantities because they provide a standardized way to measure how much of one thing you get for a fixed amount of something else!

Omar makes fruit salad using a ratio of 2 blueberries to 10 strawberries. Give two different unit rates using this relationship. How many blueberries are needed if 15 strawberries are used?

Learn how to calculate unit rates using a ratio of 2 blueberries to 10 strawberries. This problem teaches how to find two unit rates and use proportions to determine the number of blueberries for 15 strawberries. Suitable for Grades 5-7.

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