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Students of a class are made to stand in rows. If one is extra in a row, there would be 2 rows less. If one student is less in a row there would be 3 rows more, then the number of students in a the class is

a)45 b)60 c)50 d)80

Note by Reeshabh Ranjan
4 years, 8 months ago

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Hint: call $$r$$ the number of rows (initially), $$s$$ the number of students, and $$l$$ the length of a row (initially). By doing that, you get 3 equations with 3 unknowns, which you can solve.

- 4 years, 8 months ago