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Suppose n is an integer, such that the sum of the digits of n is 2, and 10^10 < n < 10^11 . The number of different values for n is:

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a 90 kg salt solution has 10% salt in it how much water must be evaporated from it so that solution contain 25% salt. A cistern is two-third full of water. Pipe A can fill the remaining part in 12 minutes and pipe B in 8 minutes. Once the cistern is emptied, how much time will these two pipes take to fill it together completely.