Final answer:
To estimate the work done to mow a lawn, we need to calculate the area of the lawn and then determine the amount of work needed to cover that area.
Step-by-step explanation:
To estimate the work done to mow a lawn, we need to calculate the area of the lawn and then determine the amount of work needed to cover that area. Since the lawn is 10 m by 20 m, the area is 10 m * 20 m = 200 square meters. Work is calculated using the formula work = force * distance. In this case, since we don't have the force, we cannot accurately estimate the work. Therefore, none of the provided options (A, B, C, D) are correct.