A sum is to be paid back in 3 equal annual instalments. The interest is compound annually at 30% per annum. If each instalment be Rs.21970 then what is the sum?

What will come in place of question mark(?) in the following number series?
119 , 131, 155, 191, 239, (?)

The smallest perfect square divisible by each of 6, 12 and 18 is : 

If the 5 digit number 538xy is divisible by 3, 7 and 11, then the value of (x² +y²)  is:

The largest number, which divides 25, 73 and 97 to leave the same remainder in each case, is 

If the length of the three sides of a triangle are 6 cm, 8 cm, and 10 cm,  then the length of the median to its greatest side is

The curved surface area of a cylindrical pillar is 264 square meter and its volume is 924 cubic meters. Find the ratio of its diameter to its height.