The Dragon Boat festival is very popular in China, it usually comes in May or June. On that day, people eat a special food--- rice dumplings. It is known as dragon-boat racing. Dragon-boat racing is the most popular activity during the festival. A dragon boat looks like a dragon, and is painted in red, white, yellow or black. Usually, a dragon boat is 20 to 40 metres long, and needs 20 people to row. Boatmen row the boat in cadence   with the drumbeats , and a man in the front of the boat waves a small flag to help coordinate  the rowing. Dragon-boat racing becomes a popular activity in South China. International  dragon-boat racing is held in Guangzhou and Hong Kong every year. A Dragon boat needs   _   people to row.
20 40 60 30