What to say???????

Person A went to a restaurant which had a guard near the door. The guard said"5". The person A didn't know what to say and tried to observe others. Person B went to the door and the guard said" 12". Person B said "6" and the guard opened the door. Person C came and the guard told " 6"and person C said "3" and the guard opened the door.

Got an Idea!!!!!!!!

Person A went again and the guard asked"10". What did the person A say. Let the number be x. Enter the answer as 2(x)+8(6-x)

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