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If 80 lamps can be lighted 5 hours per day for 10 days for Rs. 21.25, then the number of lamps which can be

If 80 lamps can be lighted 5 hours per day for 10 days for Rs. 21.25, then the number of lamps which can be lighted 4 hours daily for 30 days for Rs. 76.50, is: 1. 190 120 3. 140 4. 130 None of these 2. 5.

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