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Of the goose eggs laid at a certain pond, 23 hatched, and 34 of the geese that hatched from those eggs survived the first month. Of the geese that survived the first month, 35 did not survive the first year. If 120 geese survived the first year and if no more than one goose hatched from each egg, how many goose eggs were laid at the pond?
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2/3hatch，3/4hatch的survive the first month,那survive first month的就是2/3*3/4=1/2,3/5的没有活过第一年，那活过第一年的就是1/2*2/5=1/5，活过第一年的总数是120，所以laid的鹅的总数量就是120除以1/5=600
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