Ans 41). Only 0 1 6 8 and 9 can be readupside down.So on rearranging these digits we get the answer as 10968.

Ans 42).  2 , 5 , 1 , 3 , 6 , 4

Ans 43). Distance travelled in north and south directions
1/2 - 1/8 + 1/32 - 1/128 + 1/512 - and so on
= 1/2/((1-(-1/4))
Similarly in east and west directions
1- 1/4 + 1/16 - 1/64 + 1/256 - and so on
= 1/(( 1- ( - 1/4))
Add both the answers

Ans 44). 2 power 9 x 5 power 9

Ans 45). 1,6 and 6

Ans 46). A

Ans 47). Rs 250/-

Ans 48). Afternoon ; A is Salman.

Ans 49). 20
g - grass at the beginning
r - rate at which grass grows, per day
y - rate at which one cow eats grass, per day
n - no of cows to eat the grass in 96 days
g + 24*r = 70 * 24 * y
g + 60*r = 30 * 60 * y
g + 96*r = n * 96 * y
Solving, n = 20. 
 
Ans 50). The two quantities are equal