exam Maths Puzzle Numerical Ability

find two consecuive positive integers if the difference of their reciprocals is 1/12

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exam Other Question

One pipe alone will fill a tank in 7 1/2 hrs. A second pipe will fill it alone in 10 hrs. I the second pipe were open for 8 hrs. and then closed, how long would the first pipe take to finish filling the tank? if 27 million is 98% of the population how much is the other 2%?