If Joanie wants 3 cups, Mitchell wants 4 cups, Miles & Davis want 6 cups and Cliff wants 3 cups then they want 3+4+6+3 = <<3+4+6+3=16>>16 cups of popcorn
Every 2 tablespoons makes 4 cups and they want 16 cups so 16/4 = <<16/4=4>>4 groups of 2 tablespoons are needed.
Thus they need 4 * 2 = <<4*2=8>>8 tablespoons in total.
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