Suppose the average weight of 9 persons is 50 kg. The average weight of the first 5 persons is 45 kg, whereas the average weight of the last 5 persons is 55 kg. Then the weight of the 5th person will be

What is the total number of digits printed, if a book containing 150 pages is to numbered from 1 to 150?

There are certain 2-digit numbers. The difference between the number and the one obtained on reversing it is always 27. How many such maximum 2-digit numbers are there?

 If the route between G and C is closed, which one of the following stations need not be passed through while travelling from H to C?

In how many different ways can a train navel from F to A without passing through any station more than once?

While travelling from C to H, which one of the following stations must be passed through?