Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the related number from the given alternatives.
 
47 : 57 : : 93 : ?

A sum of money invested for 2 yrs and 9 months at the rate of 8% simple interest per annum became Rs.732 at the end of the period. What was the sum that was initially invested?

If R019 is divisible by 11, find the value of the smallest natural number R?

How much does one need to add to 2/3 to obtain 3/2?

A certain number of men agreed to do a work in 20 days. 5 men did not come for work. Others completed the work in 40 days. Find the number of men who had agreed to do the work originally.

An inverted conical shaped vessel is filled with water to its brim. The height of the vessel is 8 cm and radius of the open end is 5 cm . When a few solid spherical metallic balls each of radius 1⁄2 cm are dropped in the vessel , 25% water is overflowed. The number of balls is:

The number of students in a class is increased by 20% and the number now becomes 66. Initially the number was

What are the co-ordinates of the centroid of a triangle, whose vertices are A(-2,5), B(3,-2) and C(5,3)?