Book Maths Puzzle

90,180,12,50,100,200,?,3,50,4,25,2,6,30,3

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Book Other Question

If you reverse the digits of Alan's age it is the same as Brian's age. The difference between their ages is twice Carol's age and Brian is 10 times as old as Carol. What are their ages? If the price of petrol increases by 25% and Rajesh intends to spend only 15% more on petrol, by how much % should he reduce the quantity of petrol that he buys?