Last winter Armand had 5 sixths of a row of stacked logs. At the end of the winter he had 8 over 15 of the same row left. How much wood did he burn over the winter?

Subtract the amount left from the amount Armand started with: 5/6 − 8/15. Using a common denominator of 30 gives 25/30 − 16/30 = 9/30, which simplifies to 3/10. Armand burned 3 tenths of a row, choice C.

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