1. Still One in two or 50%

2. 56

3. 3 pm

4. It would be possible to lose a square manhole cover down the square hole that it covered: not possible with a round one.

5. 26

6. Four and two sevenths: (1 x 2 ÷ 3, 2 x 3 ÷ 4, 3 x 4 ÷ 5, 4 x 5 ÷ 6, 5 x 6 ÷ 7)

7. One dog, one cat, one fish

8. x = 18

9. x = 20

10. x = 4