75
144/8 = 18
25
Standard studs are spaced 16" apart. 30 feet times 12 inches = 360 inches. 360 inches divided by 16 inches = 22.5. If you are measuring left to right, the right-side stud from the frame becomes the last one. Depending on how you will compensate for the extra 8" at the end, you will need 21 or 22 2x4s.
224
648
600
There are: 20 feet times 30 feet = 600 square feet
600=20 * 30
600 square feet (20x30=600)
144/8 = 18
assuming you mean 20ft by 30ft, you just find the area. To find the area, simply multiply both sides, so 20x30 = 600 sq ft
The answer will depend on what units the floor is measured in: 20x30 square inches? sq feet? sq metres? Since you have not bothered to provide that information, I cannot provide a sensible answer. Furthermore, there are various sizes for sheets of plywood as well.
20x30
First, find out how many square feet are in the room. 20 X 30 = 600 Then, a square yard is equal to three square feet so divide the square feet by three. 600 / 3 = 200 The answer is 200 square yards. You are welcome.
25
A 20x30 frame can be purchased from places such as: amazon, ebay, argos and also specialist framing shops. They come in many different colours depending on what is needed.
Standard studs are spaced 16" apart. 30 feet times 12 inches = 360 inches. 360 inches divided by 16 inches = 22.5. If you are measuring left to right, the right-side stud from the frame becomes the last one. Depending on how you will compensate for the extra 8" at the end, you will need 21 or 22 2x4s.