Book Maths Puzzle

How many litres of pure acid are there in 8 litres of a 20% solution?

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Book Other Question

The price of a car is Rs. 3,25,000. It was insured to 85% of its price. The car was damaged completely in an accident and the insurance company paid 90% of the insurance. What was the difference between the price of the car and the amount received ? John's salary was decreased by 50% and subsequently increased by 50%. How much percent does he loss?