Q. 205.0( 6 Votes )

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?

Answer :

45% of solution of acid = 1125 litres


Let x litres of water is added


Resulting mixture = x + 1125 litres


The resulting mixture has to be more than 25% but less than 30% acid content.


Amount of acid in resulting mixture = 45% of 1125 litres.


45% of 1125 < 30% of (x + 1125) and 45% of 1125 > 25% of (x + 1125)


45% of 1125 < 30% of (x + 1125)



45 × 1125 < 30x + 30 × 1125


(45 – 30) × 1125 < 30x


15 × 1125 < 30x


x > 562.5 ………..(I)


45% of 1125 > 25% of (x + 1125)



45 × 1125 > 25x + 25 × 1125


(45 – 25) × 1125 > 25x


25x < 20 × 1125


x < 900 …..(II)


562.5 < x < 900


Number of litres of water that has to be added will have to be more than 562.5 litres but less tan 900 litres.

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