The answer to your question is C
I believe b is about 16.3, hope this helps
If we take the value of t to be 15 and then we perform the calculations of 2 times t divided by 3, we can express it all by two equations substituting the value given for t like so:
t = 15
2t/3 = 2(15)/3 = 30/3 = 10
Answer 28 because you plug it in for your answer.
67.5 divided by 11.25 equals 6 so you made 6 costumes