Exam Maths Puzzle undefined

If two positive numbers are in the ratio 5:2 , then by what percent is the second number less than the first?

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Exam Other Question
∑(from n=1 to ∞)arctan t/1+ar.ar+1 where an is decreasing AP with first term 1 and common difference is d Narasimha's salary was first increased by 40% and then decreased by 40%. If his present salary is Rs.16800, then what was his original salary?