I didn't even do math functions back in school and I can still figure it out.
I'll get you started:
65+f(1/4)=65*f(1/4)
64*f(1/4)=65
f(1/4)=65/64
f(1/4)=1.015625
You can figure it out from here surely. Think about what mathematical equation would get 65 from 4 and 1.015625 from 1/4 and then apply it to the number 6. It's stupidly obvious when you think about it. Post back here with the function when you are done and I will tell you if it is correct.
@TheCyberSleuth: Philanthropy in education was at a high in the 17th/18th century when there were people who could not afford an education. Now you are saying that businesses get paid money so that kids can be spared from an education that has already been paid for? What is wrong with the world?