Consider the following series of reactions:

$A+$BlongrightarrowC$G=\frac{25(kJ)}{(mol)}$

ClongrightarrowD$G=-\frac{10(kJ)}{(mol)}$

DlongrightarrowE$+FG=-\frac{20(kJ)}{(mol)}$

What is $G$ for the following reaction in $k\frac{J}{m}ol?$

$A+$BlongrightarrowE$+F$