Exam Maths Puzzle Percentage

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?

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Exam Other Question

Study the following table and answer the questions given below it.
Country --------- 1975 ------ 2030
1.United States - 141 ------- 382
2.Japan --------- 120 ------- 238
3.France -------- 67 -------- 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?