A have a set of rectangular ranges (20 rows and 5 columns) and I want
to loop through each cell, taking the values in the various cells as
inputs and populating the corresponding cell in another range with the
output.

That is to say:

inputA = Range("C7:G26")
inputB = Range("K7:O26")
output = Range("C30:G49")

The output is the result of the worksheet functions.

Assuming my function is output = A + B, I want to loop through so that:

C30.value = C7.value + K7.value
D30.value = D7.value + L7.value
....
C31.value = C8.value + K8.value
....
G49.value = G26.value + O26.value

What's the best way to achieve this?