Chapter 3, Problem 16CCSR

To determine

To find: the number of square feet mow can in 45 min.

Answer to Problem 16CCSR

45 minutes on e can mow $3600{\text{ft}}^{\text{2}}$ of grass

Explanation of Solution

Given information:

  $400{\text{ft}}^{\text{2}}$ can mow of grass if work for 5 min, $800{\text{ft}}^{\text{2}}$ can mow work for 10 min, $1200{\text{ft}}^{\text{2}}$ of grass work for 15 min.

Calculation:

In 5 minutes the area covered is $400{\text{ft}}^{\text{2}}$ .

In 10 minutes the area covered is $800{\text{ft}}^{\text{2}}$ .

In 15 minutes the area covered is $1200{\text{ft}}^{\text{2}}$ .

Observe that the times taken to cover the area are multiples of 5 and the area covered are multiples of 400.

Continuing in the same pattern, fill the grid to find the area covered in 45 minutes.

Time Taken	5	10	15	20	25	30	35	40	45
Area Covered	400	800	1200	1600	2000	2400	2800	3200	3600

Therefore, in 45 minutes on e can mow $3600{\text{ft}}^{\text{2}}$ of grass.