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81 A sudent scores 25% and fails by 60 marks, while an another sudent who scores 50% marks, gets 40 marks more than the passing mark of the examination. Find the full marks for the examination:
82 Preti's math test consist of 85 questions from three chapters A, B and C. 10 questions from chapter A, 30 questions from chapter B and 45 question from chapter C. Although, she answered 70% of chapter A, 50% of chapter B and 60% of chapter C correctly. She did not pass the test because she got less than 60% of the total marks. How many more questions she would have to answer correctly to earn 60% of the marks which is passing grade?
83 Because of tsunami, the price of a land decreases by 12% and it's production also decreases by 4%. What is the total effect on revenue?
84 In a school, 10% of boys are equal to the one-fourth of the girls. What is the ratio of boys and girls in that school?
85 From 2019 to 2020, the sales of a book decreased by 80%. If the sales in 2021 was the same as in 2019, by what per cent did it increase from 2020 to 2021?
86 In an Panchayat election between two candidates A and B, the number of valid votes received by A exceeds those received by B by 15% of the total number of votes polled. If 20% of the votes polled were invalid and a total of 8720 votes were polled, then how many valid votes did B get?
87 An alloy of gold and platinum weights 50g. It contains 80% gold. How much gold should he added to the alloy, so that percentage of gold is increased to 90?
88 Yash sells his goods 25% cheaper than Shivay and 25% dearer than Lucky. How much percentage is Lucky's goods cheaper than Shivay?
