Mathematics, 02.08.2019 17:30, dashavasilisk

Of the 150 houses in a certain development, 60 percent have air-conditioning, 50 percent have a sunporch, and 30 percent have a swimming pool. if 5 of the houses have all three of these amenities and 5 have none of them, how many of the houses have exactly two of these amenities?

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Of the 150 houses in a certain development, 60 percent have air-conditioning, 50 percent have a sunp...