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6in = 0.5ft 34.5ft/0.5ft = 69 You will need 69 of the 6in boards.
7*4 =28 square foot boards 192/28 = 6.857142857142857 = 7 boards
roundup
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You have provided the length and width of the boards but only the width (height) of whatever you wish to board. there is no information on its length and consequently, the question cannot be answered.