Solve
-Find Two Numbers Whose Sum Is 120 and Whose $x$

Multiple Choice

Solve.
-Find two numbers whose sum is 120 and whose product is as large as possible. [Hint: Let $x$ and $120 - x$ be the two numbers. Their product can be described by the function $f ( x ) = x ( 120 - x )$ .]

A) 60 and 180
B) $\frac { 1 } { 60 }$ and $\frac { 13 } { 60 }$
C) 59 and 61
D) 60 and 60