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2014-07-29T11:26:47+05:30
There will be 5 benches and 16 students.[verify the by actually doing the sum]
1 3 1
2014-07-29T11:46:43+05:30

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b benches  and s students
3 b = s -1     3 students sitting on b benches.  one student left
4 (b-1) =  s     4 students sitting on b-1 benches. all students sit.
 So    4b -4 = 3 b + 1  =>  b = 5  s = 16
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