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प्रश्न
A wrist watch loses 10 sec in every 8 hours; in how much time will it lose 15 sec.?
बेरीज
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उत्तर
10 sec. are lost in = 8 hours
∴ 1 sec will be lost in = `8/10` hours
and 15 sec. will be lost in `= 8/10 xx 15` hours = 12 hours
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