Correct Answer: 10 liters
Explanation:
Given:
Let x = liters of water to be added
Then, new water = 30 + x
New total mixture = 150 + x
We want:
(30 + x) / (150 + x) = 25/100 = 1/4
Step 1: Cross-multiply:
4(30 + x) = 150 + x => 120 + 4x = 150 + x => 3x = 30 => x = 10
Answer: 10 liters of water should be added.
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