Answer:
No. (see below)
Explanation:
If you match up the ratios like this:
18 : 9
4 : 3
Matching the two numbers (one on top of another, since they correspond to each other), you can see that these are not equivalent.
Here's why:
The top ratio is 18 to 9, which can be represented by 18 total people to 9 girls in the amount of total people.
We know that the number of boys will also be 9 because 9 is half of 18.
Let's look at the second ratio:
This can be represented by 4 total people to 3 girls in the amount of total people.
4 - 3 = 1
So there would be only 1 boy. Meaning that they're not equal because 1 is not half of 4. It would only be 1/4.
1/4 ≠ 1/2
If we make them similar denominators, you can really see it:
1/4 ≠ 2/4