L&T Company Numerical Ability Alligation or Mixture

Two same glasses are respectively 2/3rd and 3/4th full of milk. They are then filled with water and the contents is mixed in a tumbler. The ratio of milk and water in the tumbler is?
A. 17:7 B 8:3 C. 21:11 D. 27:10

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L&T Other Question

What is the difference between primary key and unique key?
A)Primary Key is used to identify a column (record) in a table, whereas Unique-key is to prevent duplicate values in a row (with the exception of a null entry) B)By default SQL-engine creates Non-Clustered Index on primary-key if not exists and Clustered Index on Unique-key C)Primary key does not include Null values, whereas Unique-key can
D)Table can have multiple primary key but can have single Unique-key E)You can change or delete primary values, but Unique-key values can not be changed
6 men and 10 boys finish a piece of work in 6 days, 4 men and 12 boys do it in 7 days. The ratio between the efficiencies of a man and boy is?
A.2:1 B.4:3 C.3:2 D.3:1