Book Maths Puzzle

Find the number of numbers till 50000(less than 50k) whose sum of digits is 13.

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Book Other Question

There are 10 prizes and 25 blanks in a lottery. If John has taken a lottery, what is the probability for him to get a prize? A takes 5 days less than the time taken by B to do some work. They can do the work together in 6 days. Find the number of days in which each of them can do the work separately.