This Can be arrived in 2 simple ways.

=SUMIF($A$2:$A$6,$C2,$B$2:$B$6)

OR

=SUMPRODUCT(($A$2:$A$6=$C2)*($B$2:$B$6))

Change the Cell Reference A2:A6 to your desired cell in the above formula,
if required.

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--------------------
(Ms-Exl-Learner)
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"John" wrote:

Hi all,

I need help on writing formula for the problem below:

Column A Column B Column C
CHJ 15 AGB
AGB 10 HHH
JKX 12 NNN
MNB 19 MMM
AGB 20 BBB
. . .
. . .
. . .

I want to be able to write " If one or more value in Column A equal to one
of the value in Column C then Sum column B ". In this case the answer is " 30
", the sum of "AGB".

Thank you
John