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The traffic lights at three different road crossings change after every 48 sec., 72 sec and 108 sec. respectively .If they all change simultaneously at 8:20:00 hours, then at what time they again change simultaneously .
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Two numbers are in the ratio of 15:11. If their H.C.F. is 13, find the numbers.
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Find the least number which when divided by 20,25,35 and 40 leaves remainders 14,19,29 and 34 respectively.
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Find the least number which when divided by 5,6,7, and 8 leaves a remainder 3, but when divided by 9 leaves no remainder .
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