Among four friends, A is twice as heavy as B. C is half of B's weight. D is 60 kg heavier compared to B but 60 kg lighter compared to A. Who is the heaviest among them?

Among four books, Book 1 is twice as heavy as Book 2. Book 3's weight is half of Book 2's weight. Book 4 is 60 grams heavier than Book 2 but 60 grams lighter than Book 1. Which book is the heaviest?

Six colleagues work together in an office. Ted is younger than Ann. Elle is older than Ricky. Stuart is older than Ted. Ted is of the same age as Elle. Ricky is not younger than Veronica. Stuart is younger than Ann. Which of the following options is NOT correct according to the above information?