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A small disc of radius r is cut out from...

A small disc of radius `r` is cut out from a disc of radius `R`. The weight of the disc which now has a hole in it, is reduced to `(24)/(25)` of the original weight. If `R=x\ r`, what is the value of `x`? (a) 4 (b) 4.5 (c) 24 (d) 25 (e) None of these

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