Q: How much sand would you need for a area 18 square meters 1 inch high?

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It would have an area of 7.24 times 4.002 = 28.97448 square meters

160 square meters.

18 meters (length x height).

Think of the room as a box with four sides and a bottom. You want to know the area of the bottom. You know that the total area of all four sides added together is 120 square meters. You don't know the dimensions of each wall yet, but you know the ratio: length is twice the breadth or width. You know that the height of each side is 4 meters. So use those values to assign variables to the length and width of each side. Each set of opposite sides will be equal in area. Say there are four sides: A, B, C and D. Sides A and C are opposite each other; sides B and D are opposite each other. Say sides A and C are the longer sides. That means that sides A and C are each 2x meters long and 4 meters high. The area of each side is 8x square meters. Sides B and D are the shorter sides. They are each x meters long and 4 meters high. The area of each side is 4x square meters. Now you have an expression for the area of each of the four sides. Set their sum equal to 120 square meters and solve for x. 8x + 8x + 4x + 4x = 120 24x = 120 x = 5 So x = 5. That tells you that the length of sides A and C is 2(5) = 10 meters each, and the length of sides B and D is 5 meters each. That gives you the information to solve for the area of the bottom of the box, or the floor. Just multiply the lengths: 5 x 10 = 50 square meters. The floor of the room is 50 square meters. Two of the walls are 10 x 4 or 40 square meters each, and two of them are 5 x 4 or 20 square meters each. Altogether the four walls are 40 + 40 + 20 + 20 = 120 square meters. Drawing a diagram in these kinds of problems really helps!

The area of that wall would be 138 square feet.

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It would have an area of 7.24 times 4.002 = 28.97448 square meters

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If the width is 4 meters and the length is 5 meters, then the floor is 20 square meters. If you meant the volume of the room in cubic meters, then you multiply the area of the floor, 20, by the height, 2.5. The answer is 50 cubic meters.