I think that is the answer because it says 2/5 where two rows are shaded and three more rows remain unshaded so, when you add that three and two it's altogether 5, so I think that is the answer, please check out the document I have uploaded.
An HVAC tech needs to figure out the size of a room to put in the correct size air duct. The room is 11.5 feet wide, 13 feet lon
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