Total liters of water needed = number of attendee x water consumption/attendee where number of attendee = 7000 attendee water consumption/attendee = 0.5litre of water/attendee total = 7000 x 0.5 litre = 3500 litres computing the water requirement per 200 litre container water requirement in the event = 3500 litres/200 litre /container = 17.5 containers The water requirement in the event at the arena of 7000 attendees is 17.5 containers.