General Intelligence · Syllogism

Three statements are given, followed by three conclusions numbered I, II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follows/follow from the statements. Statements: All clowns are books. Some books are heavy. Some heavy are trucks. Conclusions: I. Some books are clowns. II. All books are heavy. III. Some trucks are heavy.