By Mansi Yadav

Verified by Ajay Kumar

A brine tank has 100 liters of 40% salt solution. Water is added to reduce it to 25%, but then 10 liters are lost due to overflow. What was the volume of water added?

  1. 60

  2. 65

  3. 70

  4. 75

Answer: C

Solution

Source-marked answer: 70 (C). However, under the standard interpretation, the initial salt is 40 liters. If x liters of water are added, the concentration becomes \(40/(100+x)\). Setting this to 25% gives \(40/(100+x)=0.25\Rightarrow100+x=160\Rightarrow x=60\) liters. If 10 liters of a homogeneous solution subsequently overflow, its concentration remains unchanged. Therefore, the printed conditions lead to 60 liters, not the green-marked 70 liters. The source-marked answer is preserved, but the item appears inconsistent.

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