Book Maths Puzzle

3 litre of water is added to 11 litre of a solution containing 42% of alcohol in the water. The percentage of alcohol in the new mixture is

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Book Other Question

Rs.460 was divided among 41 boys and girls such that each boy Rs.12 and each girl got Rs.8. What is the number of boys? We have a 630 ml of mixture of milk and water in the ratio 7:2. How much water must be added to make the ratio 7:3?