225 : 400 :: 625 : ?

Sumit walks 20 m. to the East from point 'A', Then walks 20 m. in South-West direction. Then walks 20 m in North-West direction and reaches at point B. Find distance b/w A and B.? 

What day of the week was July 29, 1969?

Statement :
All duster is chalk.
All blackboard is chalk.
Conclusion:
I. Some duster are blackboard.
II. some chalk are duster.

If PENCIL is coded as ? @ , = ; 7 and PAPER is coded as ? 9 ? @ 5 how will you code CLIP? 

If in a certain language, PLAYER is coded as QNDCJX, then how SINGER will be coded in the same language? 

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
_sr_tr_srs_r_srst_

Select the Veen diagram that best illustrates the relationship between the following classes.
Uncle, Relatives, Rich