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let the notes of Rs 10, 20 and So be a, 3a and 5a respectively Total money in bag = 1920 Acording to question : 10 x a + 20 x 3a + 50 x 5a = 1920 320a = 1920 a = 6 No of Rs 20 notes = 6 x 3 = 18
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S.I unit of Luminous Intensity is
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