Exam Maths Puzzle Permutation and Combination

One person is wearing Black and White shoes as his pair. If he
is having 20 white and 20 Black shoes. What will be the less
number of time he have try to take his correct pair

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Exam Other Question

In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they could eat for 60 days. Than if 20 cows, How much day they could eat? A does not live at numbers 1 or 17. F lives directly opposite B, K lives directly opposite N, and M lives directly opposite H. E does not live at numbers 5 or 7 but live directly o