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LOW tempreture .thye night in a city is 1/3 more than 1/2 hinge as a higher tempreture in a day.sum of the higher and lower tempreture is 100 C. what is low tempreture ??

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in 27 coins one coin is counterfeit what is minimum number of waitings to find out counterfeit coin??? IN a mixture ,R is 2 parts , S is 1 part. In order to make S to 25% of the mixture . How much of R is to be added??