IBM Company Numerical Ability Alligation or Mixture

A mixture has milk and water in the ratio 5:1. 20 liters of water is added and the ratio now becomes 5:6. How much milk was present in original mixture?

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IBM Other Question

Complete the series 6,120, 504, 1320 If anybody had attended the online tests of IBM in the current placement drive, started in July, for the position GBS-GD. Please mail me the questions or send me the link. Either here at m4maths or on manu.khandelwal82@gmail.com.
Thanks a lot. I need it by today night. Help !