Twenties

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Across
  1. 2. In old British coinage, a pound is 20 these
  2. 6. 20 this - animal, vegetable, mineral?
  3. 7. 20 squared
  4. 10. e^pi - pi for 20 is one of them
  5. 11. 20 is XX in these numerals
Down
  1. 1. Twenty is its atomic number
  2. 3. Twenty faces
  3. 4. 20 en Francais
  4. 5. 20/20 this
  5. 8. Another word for twenty
  6. 9. 1, 2, 4, 5, 10 - these of 20
  7. 12. They used base 20