S=(1 r)
c. find c if s = r 174 and r= 45%

The question is incorrect because of the apparent contradiction the question makes.
First statement says that a quantity S is equal to quantity r.
The second statement says that S = 174r. 
Moreover, the quantity C is not correctly linked with the equation. Please either correct the question or explain the ambiguity.

Your answer should be 1/3. i hope i could ! good luck : )