The students of a class contributed for a programme. Each student contributed the same amount. Ha...

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The students of a class contributed for a programme. Each student contributed the same amount. Had there been 15 more students in the class and each student had contributed โ‚น40 less, the total amount contributed would have increased from โ‚น 3000 to โ‚น 3200. Find the strength of the class.
(a) 25
(b) 15
(c) 10

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