In a certain Venn diagram, the circle represents illiterate people, the square represents married people, and the triangle represents unemployed people. If the region representing married people who are unemployed but not illiterate has a value of 4, how many married people are unemployed but not illiterate?

In a certain representation, a square represents people who like cricket, a circle represents people who like basketball, a rectangle represents people who like tennis, and a triangle represents people who like hockey. Which region represents people who like basketball, tennis, and hockey, but do NOT like cricket?

Study the given details carefully and answer the question that follows. In a survey of children's dessert preferences: 15 prefer pastries, 12 prefer ice creams, and 18 prefer chocolates. Specifically, 8 children prefer both pastries and ice creams but NOT chocolates. How many children prefer both pastries and ice creams but NOT chocolates?