faltan wrote:

the question stem does not say the wood cannot be sold by partial measure in yard... I do not have this understanding, this question is not very globally applicable IMO.

You are given that wood is sold "by the yard". This means that you cannot buy by partial yard. Imagine the sellers have a scale of a yard only. So they cannot measure 0.2 yards.

Amount of wood needed to make a frame = 4(2/3) feet = 14/3 feet

Amount of wood needed to make 4 frames = (14/3)*4 = 56/3 feet = 56/9 yards (since 3 feet is 1 yard) = 6.2 yards

Wood is sold at $5 a yard (and only by the yard so you cannot buy 0.2 yard). So he will need to buy 7 yards.

Total cost = 5*7 = $35

Answer (D)

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