A bus arrives every 20 min to bus stop:beginning at 6.40am and continuing till 8.40am. A passenger, not knowing the schedule, randomly arrives between 7am and 7.30am. what is the probability that he waits for more than 5 min for bus?
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The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?