Final answer:
To calculate the seed rate of the seed drill, use the formula: seed rate = (total weight of grain collected / number of wheel revolutions) * (wheel diameter / drill width).
Step-by-step explanation:
In order to calculate the seed rate of the seed drill, we need to use the formula: seed rate = (total weight of grain collected / number of wheel revolutions) * (wheel diameter / drill width).
Given that the total weight of grain collected is 0.425kg and the number of wheel revolutions is 25, we can find the seed rate. The wheel diameter is given as 125cm and the drill width is given as 18cm. Plugging these values into the formula, we get: seed rate = (0.425kg / 25) * (125cm / 18cm). Solving this equation will give us the seed rate.