Posted by Isaac on Friday, January 4, 2013 at 6:30pm.
When M+N=8 and 2R+N=8, what is the value of R?
A.16 B.4 C.4 D.8 E. It cannot be determined from the information given.

Math  MathMate, Saturday, January 5, 2013 at 12:45pm
Subtract one equation from the other to get: R=M/2.
If there is no such option, decide which answer to choose.