Question 852423
You can never have enough chocolate chips!  But for the sake of math...
F = {{{15/6}}}C
F = {{{20/6}}}
(I just used a common denominator)
Replace the value of F from the first equation into the second.
{{{15/6}}}C = {{{20/6}}}
Multiply each side by 6 (that's where the common denominator comes in)
15C = 20
Divide each side by 15
C = 1{{{1/3}}}
.
Prove it into the equation.
What is 2.5 * 1.3333?
3{{{1/3}}}
Success!