How many quadrilaterals are there in the given figure?

Directions: Each question given below consists of a statement, followed by two arguments numbered I and II. You have to decide which of the arguments is a 'strong' argument and which is a 'weak' argument.
 Give answer
 ( a ) if only argument I is strong.
 ( b ) if only argument II is strong. 
 ( C ) if either I or II is strong.
 ( d ) if neither I nor II is strong.
 ( e ) if both arguments I and II are strong.

Statement 
Should all the practicing doctors be brought under Government control so that they get salary from the Government and treat patients free of cost?
Arguments:
I. No, How can any country do such an undemocratic thing?
II. Yes, despite many problems, it will certainly help minimize, if not eradicate, unethical medical practices. 

If DRIVE is coded as 59372 and SPUR is coded as 6489, what will be the code for PRIDE? 

When “SIR” is coded as “PSPIPR” then. How MAN will be coded___

Raju ranks 10th from the top and Ravi ranks 21st from the bottom. If there are 3 students between them, how many students are there in the class? 

In the following question, one or two statements are given, followed by two conclusions. You have to consider that the statement is true even if it seems to be different from commonly known facts. You have to decide which of the given statements can definitely lead to correct conclusions.

Statement:
Some buses are four-wheelers.
All four wheelers are vans.
Conclusion:
I. Some vans are buses.
II. Some buses are vans.

Rajan is ranked 11th in the list of successful boys in a class and at 31st from the bottom. Three boys did not take the exam at all and one failed. How many students are there in the class?

Find the missing number