A project has three test cases. Three teams are formed to study the three different test cases. James is assigned to at all three teams. Except for James, each researcher is assigned to exactly one team. If each team has exactly 6 members, then what is the exact number of researchers required?

The number of ways in which 10 students can be divided into three teams,one containing 4 and others 3 each,is

In a team there are 240 members (males and females). Two-third of them are males. Fifteen percent of males are graduates. Remaining males are non-graduates. Three-fourth of the females are graduates. Remaining females are non-graduates. What is the ratio the taotal number of males and the number of females who are non -graduates?

Workers are grouped by then area of experise and are placed on at least one team. There are 20 workders on the Marketing team, 30 on the Sales team, and 40 on the Vision team. Five workers are on both the Marketing and Sales teams, 6 workers are on both the Sales and Vision terms, 9 workers are on both the Marketing and Vision teams, and 4 workers are on all three teams. How many workers are there in total?