If 3/4 of a number is 45, then the number is :

Biggest among the following is :

If 200% of a number is 160. Then 150% of that number is :

If x:y =2:3 then 5 (x-y) is :

A watch is brought when there was a special discount of 10% by paying Rs.810. Then the actual cost of the watch is :

If f (x) = 3 x ³ - 2 x ² + x + k and f (-1) = 4 then k is :