A, B and C can reap a field in 15 days; B, C and D in 14 days; C, D and A in
D, A and B in 21 days. In what time can A, B, C and D together reap it?
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Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions. Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate (ATP).
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