How many 4' x 8' sheets of plywood would be needed to provide subfloor for a 25' by 30' room?

or:How many 4 x 8 sheets of plywood would be needed to provide subfloor for a 25 by 30 room?

or:How many 4' x 8' sheets of plywood would be needed to provide subfloor for a 25' by 30' room?

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