Problem: The mouth of the River Rhine is in which country?
Answer: netherlands

Problem: In which zodiacal constellation is the bright star Aldebaran?
Answer: taurus

Problem: What name is given to the word puzzle in which a phrase, quotation or fact must be deduced from numbers and letters in the clue (eg 52 C in a P = 52 cards in a pack)?
Answer: ditloid

Problem: December 20, 1860 saw which state secede from the Union, the first of 11?
Answer:
south carolina