I'm completely lost with this math problem: Mr. Maxim works at The Best Cookeries Around restaurant. On a particular day, 50 people entered the restaurant in the morning to eat. At around 10:00, 40 more people entered the restaurant and ordered the same amount of food as the first people. After a while, twice the number of people who entered the restaurant at 10:00 came in and ordered lunch. By evening, an additional 3 times as many people as the number that came in first had entered the restaurant. Calculate the total number of people that entered the restaurant on that day.
Can you give me a hand?