It depends on how big a sheet of plywood you are talking about.
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Assuming the plywood comes in 4' by 8' sheets you would need 6 sheets to cover a 12' by 16' area.
To cover a rectangle-shaped floor measuring 16x12, you will need 6 4x8 sheets of plywood. Arrange the sheets so that the longer side of the sheets line up along the longer edge of the floor.
It depends on the size of the plywood sheets (usually 8ft x 4 ft, but not always) and also on what units used to measure the 24 x 42 area that you wish cover: inches, feet, metres?
Divide the area of the windows by the area of the sheets. Note: 3x5 and 2x4 are not areas, they are numbers. And you don't say how big the sheets are, so it is difficult to be helpful.
Area of a sheet of plywood = 4' x 8' = 32. 1700ft2/32ft2 = 53.125 54 sheets of 4' x 8' plywood would be needed to cover 1700ft2.