A party is being held at a local mansion. The host is very rich and his success is because of one thing — his famous recipe for Spaghetti! The only guests that may attend are people who correctly reply to the guard at the door. Here's where you come in. You and a friend are trying to steal this recipe. You sneak by and listen to the passwords.
The first guest arrives. The guard says 5. The guest replies 20
The second guest arrives. The guard says 3 and the guest replies 25
The third guest arrives. The guard says 10 and the guest replies 15.
Your friend walks up. The guard says 4 and you friend replies 15. He is admitted in.
You now walk up. The guard says 6.
What should you reply.
guard : 0 guest :20 guard : 1 guest : 15
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