During assembly the students are standing in a line. Salman Khan is 21st in order from both the ends. How many boys are there in the class?

Statements: 

Some pens are pencils. 

All pencils are erasers. 

Conclusions: 

I. Some pens are erasers. 

II. No pens are erasers. 

III. Some erasers are pencil 

Find the number of squares in the given figure.

How many triangles are there in the given figure?

How many triangles are there in the figure given below?
 

In the question two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements.

Statement I: No spaghetti are noodles
Statement II: Some food are spaghetti
Conclusion I: All noodles are food
Conclusion II: All food are noodles

Which will be the blank term in the following series?

h_eg_fegh_eghfe_