The area of square TUVW = 3×3 = 9 square units
1 square unit = 4 head lettuces
9 square units = 9×4 = 36 lettuces
Area of plot QRST = length × width = 12×6 = 72 square units
36 vegetables for every 9 square units
We have 72÷9 = 8 lots of 9 square units
Total vegetable = 8 × 36 = 288 vegetables
We can have 8 different vegetables, each type can have 36 vegetables