How do I add a quantity by checking its name in two columns as shown by the figure? Botsawana in column A and C should give sum result in F according to its name in E
You can use SUMPRODUCT:
SUMPRODUCT
=SUMPRODUCT(($A$1:$A$8=E1)*$B$1:$B$8+($C$1:$C$8=E1)*$D$1:$D$8)