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sparrows and pigeons sit on a fence. when 5 sparrows leave, there remain 2 pigeons for every sparrow. then 25 pigeons leave and the ratio of sparrows...

sparrows and pigeons sit on a fence. when 5 sparrows leave, there remain 2 pigeons for every sparrow. then 25 pigeons leave and the ratio of sparrows to pigeons becomes 3:1. What is the original number of birds?

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