Exam Maths Puzzle Algebra

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?

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Exam Other Question

How many kg of salt at 42 paise per kg must a man mix with 25kg of salt at 24 paise per kg so that he may, on selling the mixture at 40 paise per kg gain 25% on the outlay? One person is wearing Black and White shoes as his pair. If he
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number of time he have try to take his correct pair