Book Maths Puzzle

If the price of the petrol raised by 20%,find by how much percent a car owner must reduce his consumption so as not to increase his expenditure on petrol?

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Book Other Question

What are the next two numbers in this sequence?
1,11,21,1211,111221,??,??
In an examination 80% of examiners passed in English and 70% in mathematics. 10% of examiners failed in both the subjects. If 144 examiners passed in both the subjects, find the total number of examiners.