Thinking Skills: Critical Thinking and Problem Solving

230 Unit 5 Advanced problem solving

Answers and comments are on pages 331–33.

Crop yield: kg/m^2 Water input: litres/m^2 /day

5 10 15 20 25 30

Fertiliser: g/m^20 3.55 4.58 5.76 5.36 4.04 2.04

5 4.54 5.83 7.16 7.54 6.82 4.73

15 5.21 7.73 9.22 9.32 9.06 8.89

20 4.85 6.89 8.95 10.27 10.40 9.38

25 3.97 6.42 9.04 9.62 10.83 10.32