how many litres of water will have to be added to 1125 litres of the 45% solution of acid so that the resulting mixture will contain more than 25% but less than 30% acid content?

q13.    how many litres of water will have to be added to 1125 litres of the 45% solution of acid so that the resulting mixture will contain more than 25% but less than 30% acid content?

let  x  litres of water is required to be added.

total mixture = (x+1125) litres 

it is evident that amount of acid contained in the resulting mixture is 45% of 1125 litres.

the resulting mixture contain  more than 25 % but less than 30%  acid.

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thus, the number of litres water that is to be added will have to be more than 562.5 and less than 900 litres.