book Maths Puzzle Numerical Ability

how do you solve this: Solve for R: C=K Rr/R-r

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i need help with the following problems
:22+4y-14=0
:4(x+5)=16
:-40-(-2x+5)=-61 We have tried to slove the problem but our answer does not agree with any of our 4 muliple choice answers. We felt we did it correctly. Please help, how do you solve the problem? Show all steps. Thanks! 1/4(y-1/3)-1/6(y-3)=2/3