1. 10m X 15 m

2. Mum is 37       Girls are both 9

3. 16%

4. I hour and twenty minutes (80 minutes)

5. 40

6. (a) 25
(b) D (Months of the year, starting with July)
(c) 61 (following the rule y = x² – 3)

7. 20

8. $2.00 (End of first year $18, End of second year $6, End of third year $2)

9. 10 ways

10. The sphere is slightly larger than the cube