https://file.aiquickdraw.com/mathbot/file/1727046472886aywb5tdi.jpg

Let's solve the questions from the image:

### (a) Ratio of starfish to sea horses:
The problem states that there are **4 starfish for every 7 sea horses**. So, the ratio of starfish to sea horses is:

\[
\text{Ratio} = \frac{4}{7}
\]

So, the answer is **4:7**.

### (b) If there are 36 starfish, how many sea horses are there?
We know the ratio of starfish to sea horses is 4:7. Now, if there are 36 starfish, we can set up the following proportion:

\[
\frac{4}{7} = \frac{36}{x}
\]

Where \( x \) is the number of sea horses. To solve for \( x \), we cross-multiply:

\[
4x = 7 \times 36
\]
\[
4x = 252
\]
\[
x = \frac{252}{4} = 63
\]

Thus, there are **63 sea horses**.

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Would you like further explanation or details on these calculations?

### Related Questions:
1. If there are 28 sea horses, how many starfish are there?
2. If the ratio was reversed (7 starfish for every 4 sea horses), how would the number of sea horses change?
3. How would you express the ratio of sea horses to starfish instead?
4. What is the total number of sea creatures (starfish + sea horses) in the aquarium if there are 36 starfish?
5. If 20 more sea horses were added to the aquarium, how many starfish would need to be added to maintain the same ratio?

### Tip:
When dealing with ratios, always check if the two quantities maintain their proportional relationship before solving the problem!

In a large aquarium, there are 4 starfish for every 7 sea horses. (a) Write the ratio of starfish to sea horses. (b) If there are 36 starfish in the large aquarium, how many sea horses are there?

Learn how to solve a ratio problem involving starfish and sea horses in an aquarium. This guide walks through calculating the ratio of 4:7 and finding how many sea horses are present if there are 36 starfish, using proportions and cross-multiplication. Suitable for Grades 5-7.

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