How Much Must the Diameter of A $\frac { 31 } { 64 }$

Multiple Choice

How much must the diameter of a $\frac { 31 } { 64 }$ in. shaft be reduced so that its diameter will be $\frac { 13 } { 32 }$ in.?

A) $\frac { 3 } { 32 }$ in.
B) $\frac { 5 } { 81 }$ in.
C) $\frac { 17 } { 81 }$ in.
D) $\frac { 5 } { 64 }$ in.
E) $\frac { 17 } { 64 }$ in.