The ratio of milk to water in a 208-liter mixture is 3:5. If 70 liters of water and X liters of milk are added to the mixture, then the ratio of milk to water in the resultant mixture becomes 7:10, respectively. Find X.

Correct option is C

Quantity of milk = 208×$$\frac{3}{8}$$​=78 liters
Quantity of water = 208 - 78 = 130 liters
ATQ,
$$\frac{78 + X}{130 + 70} = \frac{7}{10}$$​
78 + X = 140
X = 62