Get results from model, order by sum of columns

In Laravel 5.3 I have a User model. I want to have the 10 users with the highest ranking on my server. The ranking is based on a sum of the columns Rank_a, Rank_b and Rank_c. How can I do that?

This is the code I have so far:

$users = User::take(10)
        ->select(DB::raw('sum(Rank_a+Rank_b+Rank_c) AS total_points'))
        ->orderBy('total_points')
        ->get();
return response()->json($users);

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