Correct Answer: 83.33 ml
Explanation:
Given:
Key Concept: When milk is sold at cost price and gain is made, the gain % is due to the addition of water. Therefore:
Gain% = (Water / Milk) × 100
So, using the gain:
9.09 = (Water / (1 - Water)) × 100
⇒ 9.09 / 100 = Water / (1 - Water)
Cross multiplying:
9.09(1 - W) = 100W => 9.09 - 9.09W = 100W => 9.09 = 109.09W => W = 9.09 / 109.09 ≈ 0.0833 liters
Convert to milliliters:
0.0833 liters = 83.33 ml
Answer: 83.33 ml of water is in 1 liter of the mixture.
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