in Joe's fish tank, there are 6 goldfish and 12 snails. How does the ratio 6:18 describe Joe's fish
tank?

Hey there!
The ratio 6:18 describes Joe's fish tank, certainly. But how?
Note that this ratio can be written as 6 to 18, 6/18, and 6 out of 18.
This ratio can show this: For every 6 goldfish in Joe's tank, there are 12 snails.
Great question!
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The correct option is C.
Given that,
Here 6:18 denotes that the number of goldfish to the total no of animals.
Here total no of animals could be
= 6 + 12
= 18
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