Exercise 2 solution

Example answer (yours will differ), for lettuce at 25 cm spacing in rows 30 cm apart:
Bed 1.2 m wide = 120 cm. Rows 30 cm apart gives 4 rows (120 / 30), about 15 cm in from each edge for the outer rows.
Row length 240 cm. Plants 25 cm apart gives about 9 or 10 per row (240 / 25 = 9.6).
Total: about 4 x 9 = 36 plants. Stagger the plants in neighbouring rows to use the space well.
Sketch (each o is a plant):
  o  o  o  o  o  o  o  o  o
  o  o  o  o  o  o  o  o  o
  o  o  o  o  o  o  o  o  o
  o  o  o  o  o  o  o  o  o
Check the actual spacing on your own packet; larger crops such as courgettes need far more room (one or two plants for the whole bed).