If \(p\) gallons of 10 percent antifreeze solution is added to \(q\) gallons of 20 percent antifreeze solution, what is the percent antifreeze of the resulting solution in terms of \(p\) and \(q\)?
(A)\(\frac { p + q } { 2 } \) (B)\(\frac { 10p + 20q } { 30 } \) (C)\(\frac { 10p + 20q } { p + q } \) (D)\(\frac { 10p + 20q } { 100 } \) (E)\(\frac { 100p + 200q } { p + q } \)
C