Its D
Because the rate of change is 1.5 and 1.5x10 is 15
Correct the first way is 1to1, 1:1, 1 boy to 1 girl .
So you can set up proportion.

Here, you need to solve for C.
You can do that by multiple both sides by 360 and then you should get

Hope this helps.
The greatest factor of 60 and 75 is 15.
Reasoning: I found the factors and prime factorization of 60 and 75. The biggest common factor number is the GCF number. So the greatest common factor 60 and 75 is 15.