Question: Please help solving these problems. Thank you in advance. 21. A positive integer is said to be twelvesh if the sum of digits in its

Please help solving these problems. Thank you in advance.

21. A positive integer is said to be "twelvesh" if the sum of digits in its decimal representation is equal to 12. For example, the first four twelvesh integers are 39, 48, 57 and 66. What is the total number of twelvesh integers between 1 and 999? 22. Two secondary one and m secondary two students took part in a round-robin chess tour- nament, In other words, each student played with every other student exactly once. For each match, the winner receives 3 points and the loser 0 points. If a match ends in a draw, both contestants receive 1 point each. If the total number of points received by all students was 130, and the number of matches that ended in a draw was less than half of the total number of matches played, what is the value of m

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