Indian Defense Minister Rajnath Singh held a high level meeting with his counterpart from which country with the recent SCO meeting?

If a : b = 20:5 then find out the value of (13a-9b): (11a-7b)?

Directions: - A cube of 4x4x4cm. side colored with yellow. After that it cut into 1 cm small side cubes. Then answer the following question?
How many total numbers of small cubes are there?

Direction:- A solid cubes two adjacent sides are coloured with Red colour and Just opposite of these sides are coloured with black colour and rest of the sides are coloured with green colour. After that this is changed into 64 small cubes.
How many such cubes are there of which one or two sides are coloured but not three sides are coloured ?

Direction: - A cube of 8 x 8 x 8 cm. side is coloured opposite surface with red, green and yellow. After that cubes is cut into 2 cm small cubes.
The number of small cubes which have three surfaces coloured with red, green and yellow? 

In a exam, a student scores four marks for every correct answer and loses one mark for every wrong answer. If Rahul attempts all sixty questions and secures 130 marks, the no of questions Rahul attempted correctly is :

Directions: - A bigger cubes of 9x9x9 cm size is coloured all surface with green. After that it is cut into three inches small cubes. Give the following answer?
The total number of small cubes are? 

Direction: A cube is coloured red on all faces. It is cut into 64 smaller cubes of equal size. Now, answer the following questions based on this statement:
How many cubes has no face coloured?