In an office of 50 people, 18 write with their right hand, 26 write with their left hand and 2 can write with both hands. How many cannot write? 

Choose the correct alternative.
Fire : Ashes :: Explosion : ? 

In the following question, select the related number from the given alternatives.
243: 819 :: 163 :?

Statements: All sparrows are birds.
                       No bird is a reptile.
Conclusions I. No sparrow is a reptile.
                      II. Some reptiles are sparrows.

Direction: In the following, select the related word from the given alternatives.
Heat : Convection :: Space : ?

The sum of the present ages of two cousins is 46 years. Eight year ago, the elder one was twice as old a the younger one. What is the present age of the elder cousin?

In a string of 20 beads, the average weight of the first 14 beads is 25 grams and that of the last 6 beads is 8 grams. What is the average weight of all the beads?

B is father of Q. B has only two children. Q is the brother of R. R is the daughter of P. A is the granddaughter of P. S is the father of A. How is S related to R?