Читать книгу The Ultimate Mathematical Challenge: Over 365 puzzles to test your wits and excite your mind - Литагент HarperCollins USD, F. M. L. Thompson - Страница 25

Crossnumber 3

ACROSS

2. The sum of a square and a cube (3)

4. Nine less than half 26 ACROSS (2)

6. 13 DOWN plus 5 DOWN minus 2 ACROSS minus 10 DOWN (3)

7. A prime factor of (6 ACROSS plus 15) (2)

8. The square root of 4 ACROSS cubed (2)

9. One more than a multiple of 8 (3)

12. Fifteen less than a cube (2)

14. A multiple of fourteen (3)

17. A prime greater than 13 and whose digits are different (2)

18. The mean of 5 DOWN, 21 DOWN and 28 ACROSS (2)

19. Three more than a square (3)

22. An even number that is less than 24 DOWN (2)

24. The sum of 9 ACROSS and a multiple of five (3)

26. The difference of two two-digit triangular numbers and also one more than an odd square (2)

28. The first two digits of the square of 17 ACROSS (2)

29. The hypotenuse of a triangle whose shorter sides are 21 DOWN and 20 DOWN (3)

30. The lowest common multiple of 10 DOWN and 15 DOWN (2)

31. A factor of 6789 (3)

DOWN

1. The square of (one more than a multiple of 29) (4)

2. A prime factor of 2008 (3)

3. A Fibonacci number that is one more than 2 ACROSS (3)

5. Two less than 11 DOWN minus 4 ACROSS (2)

10. Eight more than half 4 ACROSS (2)

11. The sum of a Fibonacci number and a triangular number in three distinct ways (2)

13. The number whose digits are those of 31 ACROSS reversed (3)

14. 3 DOWN plus 11 DOWN (3)

15. A multiple of 5 that is less than 16 DOWN (2)

16. A power of 2 that is greater than 4 ACROSS and less than 28 ACROSS (2)

20. The exterior angle, in degrees, of a regular polygon (2)

21. 70 per cent of 30 ACROSS (2)

23. A prime whose digits are increasing consecutive numbers (4)

24. A power of 2 multiplied by a power of 3 (3)

25. Three less than a multiple of seven (3)

27. 11 DOWN plus 15 plus a quarter of 4 ACROSS (2)

[SOLUTION]