In a mixture of milk and water, there is only 26% water. After replacing the mixture with 7 liters of pure milk , the percentage of milk in the mixture become 76%. The quantity of mixture is:

65 liters
91 liters
38 liters
None of these

Correct Answer: 91 liters

Explanation:

Milk Water

74% 26% (initially)

76% 24% ( after replacement)

Left amount = Initial amount $1 - \frac{r e p l a c e d a m o u n t}{t o t a l a m o u n t}$

24 = 26 $1 - \frac{7}{k}$

=> k = 91

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