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1/32(x)L=21h 10L=1h X=21x10x32 =6720 Liters Thus: 6720L=Yh 10L=1h Yh=6720/10 Y=672h
He will take the goat first to the other side leaving the wolf with the cabbage, when he returns, he will take the wolf next and bring back the goat with him, he will then take the cabbage to the other side and come back for the goat.
b=15,l=10 or b=10,l=15