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Lets first talk about the logic needed.
1. Create a variable to hold the $total. This var starts as 0
2. Loop through all the posts. This code can be found on the docs page under ‘querying posts’ or on google / WP with the get_posts function
3. for each post, find the custom field value via get_field function (read more on the ACF docs page) and add it to the $total var
4. After the loop has ended, your $total var will now contain the correct number
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