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In a classroom, there are certain num...

In a classroom, there are certain number of benches. If 6 students are made to sit on a bench, then to accommodate all of them, one more bench is needed. However, if 7 students are made to sit on a bench, then after accommodating all of them, space for 5 students is left. What is the total number of students in the class? (a) 30          (b) 42      (c) 72     (d) None of these

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