Mark invited ten friends to a party. Each friend brought three guests. How many people came to the party, excluding Mark?

40

Step-by-step explanation:

Mark invited 10 friends to a party.

Each friend brought 3 guests.

How's many people came to the party?

If each friend brought 3 guests, that would mean that each friend was 4-man,

so 4 x 10 = 40

Therefore, 40 people were present at the party