25.4

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Across
  1. 2. A long life span
  2. 3. a perfect example
  3. 5. five kids born at the same time
  4. 7. you are roughly 150 of these tall
  5. 10. a race of ten
  6. 12. absolutely destroy
  7. 13. one litre to a gallon
  8. 14. every 50 years
  9. 15. twice a quartet
  10. 16. two pairs of twins born at the same time
  11. 17. every 100 years
  12. 18. a tetrapod
  13. 20. a 7 sided polygon
  14. 21. four singers
  15. 22. split in half there will be 12 sides
Down
  1. 1. half a dectet
  2. 3. exemplary
  3. 4. boils at 100
  4. 6. a tenth of a century
  5. 8. per 100
  6. 9. double and double
  7. 11. Latin for eighth
  8. 16. quadrilateral
  9. 19. breaker of numbers