Ashraful has purchased a square sheet of plywood of 169 square feet area. To cover a wall he must cut off 3 feet from a side. What is the area, in square feet, of the wall?

Ashraful has purchased a square sheet of plywood with an area of 169 square feet. Let's call the side length of the original square sheet "x" feet.

The area of the original square sheet is given as 169 square feet:

x^2=169

To find the side length "x," we take the square root of both sides:

$\sqrt{x}$=$\sqrt{169}$​=13 feet

So, the original square sheet has a side length of 13 feet.

Now, Ashraful must cut off 3 feet from one side to cover a wall. This reduces the side length to 13−3=10 feet.

The area of the wall covered by the cut piece of plywood is:

10×13=130 square feet.

So, the area of the wall is 130 square feet. The correct answer is 130.