Quantitative Aptitude - Arithmetic Ability Questions

Find out the odd word/letters/number/number pair from the given alternatives.

What is the total number of points in the plane of triangle ABC which is equidistant from the vertices of the triangle?

Which of the following numbers is not a prime number?

A certain sum of money becomes double of itself in 15 years at a rate of simple interest. In how many years will it become 5 times of itself at the same rate of simple interest

The average weight of 3 men A, B and C is 84 Kg. Another man D joins the group and the average now becomes 80 Kg. If another man E whose weight is 3 Kg more than that of D, replaces A then the average weight of B, C, D and E becomes 79 Kg. What is the weight of A?

If 4x2 - 12x + k is a perfect square, then the value of k is

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

If (1 / 3.197) = 0.3127, find the value of (1 / 0.0003197).