If 180 litres of a mixture of a chemical solution and water contains 5% water, how much more water should be added to it so that water will be 10% in the mixture?

The initial 180 litres of mixture contains 5% water, meaning there are 9 litres of water and 171 litres of chemical solution. Let x be the amount of water to add so that the 9 plus x litres of water becomes 10% of the new total volume of 180 plus x. Solving 9 plus x equals 0.10 multiplied by 180 plus x gives 9 plus x equals 18 plus 0.10x, which results in 0.90x equals 9 and x equals 10 litres.

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