While trying to understand about op-amps, most tutorials show how op-amps can be used as adder, subtracter and an averaging amplifier. However none of the tutorials gives any real world examples for those type of circuits.
Could you please give some real world examples for using op-amp as adder, subtracter and an averaging amplifier?
Specifically, why do we need to add up voltages? or subtract? or need to find average?