In a family, there are three generations: grandparents, parents, and children. If the grandparents have two children, and each child has two children, how many grandchildren are there?
In a group of five friends: A, B, C, D, and E, A is taller than B but shorter than C. D is shorter than E but taller than A. Who is the tallest among them?
A, B, C, D, and E are five students who scored different marks in a test. A scored more than B but less than C. D scored less than E but more than A. Who scored the least?