Question
In a zoo, there are rabbits and pigeons. If heads are
counted, there are 200 and if legs are counted, there are 580.How many pigeons are there.Solution
Heads count = 200 Legs count =580 Average legs count for per head = 580/200 = 29/10 
Rabbits: pigeons = 9: 11 Numbers of pigeons = (11/20) ×200 =110
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