Conditional Formatting: Number to change as cells are coloured [Closed]

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Hello,

I am using Number to create a spreadsheet.

I am colour coding different cells based on number of guests not attending.

When I change their cell colour to Red, I would like my 'Total' cell (G2) to add up the number of Red cells so that I don't have to keep recounting every time I add Red cells.

Hope this makes sense!

Thanks!
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